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Nature's Proper Course
Marcus Aurelius
Meditations

The author argues that a rational nature finds contentment by avoiding falsehood, seeking the common good, and embracing whatever fate the universe provides.

...f thee as thou art a man, be not diverted from what thou art about, and speak that which seemeth unto thee most just: only speak it kindly, modestly, and without hypocrisy. V. That which the nature of the universe doth busy herself about, is; that which is here, to transfer it thither, to change it, and thence again to take it away, and to carry it to another place. So that thou needest not fear any new thing. For all things are usual and ordinary; and all things are disposed by equality. VI.
Every particular nature hath content, when in its own proper course it speeds. A reasonable nature doth then speed, when first in matter of fancies and imaginations, it gives no consent to that which is either false uncertain. Secondly, when in all its motions and resolutions it takes its level at the common good only, and that it desireth nothing, and flieth from nothing, bet what is in its own power to compass or avoid. And lastly, when it willingly and gladly embraceth, whatsoever is dealt and appointed unto it by the common nature.
For it is part of it; even as the nature of any one leaf, is part of the common nature of all plants and trees. But that the nature of a leaf, is part of a nature both unreasonable and unsensible, and which in its proper end may be hindered; or, which is servile and slavish: whereas the nature of man is part of a common nature which cannot be hindered, and which is both reasonable and just. From whence also it is, that according to the worth of everything, she doth make such equal distribution...
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Marcus Aurelius

Meditations

The Method to Happiness

This excerpt directly agrees with the parent's thesis that a reasonable nature finds contentment by choosing the right way in opinions and actions. It extends the idea by noting that this ability is common to God and humans, and that happiness consists in the practice of righteousness.

...od? and to be in credit among such, be but vanity? What is it that thou dost stay for? an extinction, or a translation; either of them with a propitious and contented mind. But still that time come, what will content thee? what else, but to worship and praise the Gods; and to do good unto men. To bear with them, and to forbear to do them any wrong. And for all external things belonging either to this thy wretched body, or life, to remember that they are neither thine, nor in thy power. XXVIII.
Thou mayest always speed, if thou wilt but make choice of the right way; if in the course both of thine opinions and actions, thou wilt observe a true method. These two things be common to the souls, as of God, so of men, and of every reasonable creature, first that in their own proper work they cannot be hindered by anything: and secondly, that their happiness doth consist in a disposition to, and in the practice of righteousness; and that in these their desire is terminated.
XXIX. If this neither be my wicked act, nor an act anyways depending from any wickedness of mine, and that by it the public is not hurt; what doth it concern me? And wherein can the public be hurt? For thou must not altogether be carried by conceit and common opinion: as for help thou must afford that unto them after thy best ability, and as occasion shall require, though they sustain damage, but in these middle or worldly things; but however do not thou conceive that they are truly hurt there...

Aristotle

Nicomachean Ethics

Happiness with Moderation

Aristotle challenges the Stoic self-sufficiency advocated by Marcus Aurelius by asserting that human happiness, while primarily contemplative, requires a measure of external prosperity. This contradicts the parent's claim that contentment is entirely within one's power through reason and acceptance of fate.

...such Working. To the Gods then all their life is blessed; and to men in so far as there is in it some copy of such Working, but of the other animals none is happy because it in no way shares in Contemplative Speculation. Happiness then is co-extensive with this Contemplative Speculation, and in proportion as people have the act of Contemplation so far have they also the being happy, not incidentally, but in the way of Contemplative Speculation because it is in itself precious. Chapter VII.
So Happiness must be a kind of Contemplative Speculation; but since it is Man we are speaking of he will need likewise External Prosperity, because his Nature is not by itself sufficient for Speculation, but there must be health of body, and nourishment, and tendance of all kinds. However, it must not be thought, because without external goods a man cannot enjoy high Happiness, that therefore he will require many and great goods in order to be happy: for neither Self-sufficiency, nor Action, stand in Excess, and it is quite possible to act nobly without being ruler of sea and land, since even...
And this may be clearly seen in that men in private stations are thought to act justly, not merely no less than men in power but even more: it will be quite enough that just so much should belong to a man as is necessary, for his life will be happy who works in accordance with Virtue. Solon perhaps drew a fair picture of the Happy, when he said that they are men moderately supplied with external goods, and who have achieved the most noble deeds, as he thought, and who have lived with perfect...

Aristotle

Nicomachean Ethics

Divine Simplicity's Pleasure

Aristotle reframes the discussion from reason and virtue to the nature of pleasure and simplicity. He suggests that true, invariant pleasure belongs to beings with simple natures like the divine, implying a different standard for evaluating contentment than the parent's focus on reason and the common good.

...-Mastery, i.e. low and bad. But those Pleasures which are unconnected with Pains do not admit of excess: i.e. such as belong to objects which are naturally pleasant and not merely as a matter of result: by the latter class I mean such as are remedial, and the reason why these are thought to be pleasant is that the cure results from the action in some way of that part of the constitution which remains sound. By “pleasant naturally” I mean such as put into action a nature which is pleasant.
The reason why no one and the same thing is invariably pleasant is that our nature is, not simple, but complex, involving something different from itself (so far as we are corruptible beings). Suppose then that one part of this nature be doing something, this something is, to the other part, unnatural: but, if there be an equilibrium of the two natures, then whatever is being done is indifferent. It is obvious that if there be any whose nature is simple and not complex, to such a being the same course of acting will always be the most pleasurable. For this reason it is that the Divinity feels...
The reason why the Poet’s dictum “change is of all things most pleasant” is true, is “a baseness in our blood;” for as the bad man is easily changeable, bad must be also the nature that craves change, i.e. it is neither simple nor good. We have now said our say about Self-Control and its opposite; and about Pleasure and Pain. What each is, and how the one set is good the other bad. We have yet to speak of Friendship. BOOK VIII Chapter I. Next would seem properly to follow a dissertat...

Marcus Aurelius

Meditations

Nature's True Requirement

This excerpt provides clear practical guidance: one should take pains to understand what human nature requires and let nothing else distract, as happiness is found in practicing those things which the nature of man demands.

...u hast therefore been confounded in thy course, and henceforth it will be hard for thee to recover the title and credit of a philosopher. And to it also is thy calling and profession repugnant. If therefore thou dost truly understand, what it is that is of moment indeed; as for thy fame and credit, take no thought or care for that: let it suffice thee if all the rest of thy life, be it more or less, thou shalt live as thy nature requireth, or according to the true and natural end of thy making.
Take pains therefore to know what it is that thy nature requireth, and let nothing else distract thee. Thou hast already had sufficient experience, that of those many things that hitherto thou hast erred and wandered about, thou couldst not find happiness in any of them. Not in syllogisms, and logical subtilties, not in wealth, not in honour and reputation, not in pleasure. In none of all these. Wherein then is it to be found? In the practice of those things, which the nature of man, as he is a man, doth require.
How then shall he do those things? if his dogmata, or moral tenets and opinions (from which all motions and actions do proceed), be right and true. Which be those dogmata? Those that concern that which is good or evil, as that there is nothing truly good and beneficial unto man, but that which makes him just, temperate, courageous, liberal; and that there is nothing truly evil and hurtful unto man, but that which causeth the contrary effects. II. Upon every action that thou art about, put this...