“Everything is in a state of metamorphosis. Thou thyself art in everlasting change and in corruption to correspond; so is the whole universe.”
Meditations. ix. 19.
Bartlett's Familiar Quotations, 10th ed. (1919)
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Marcus Aurelius 400
Emperor of Ancient Rome 121–180Related quotes

De visione Dei (On The Vision of God) (1453)

“Jove is not one half so merciless
As thou art to thyself.”
Sylphs
Poems (1851), Prometheus
Context: Jove is not one half so merciless
As thou art to thyself. But fare thee well;
Our love is all as stubborn as thy pride,
And swift as firm.
“Once thou art wed, no longer canst thou be
Lord of thyself.”
Fabulae Incertae, Fragment 34, 7.

“Thou art a dreaming thing,
A fever of thyself.”
Source: Bright Star: Love Letters and Poems of John Keats to Fanny Brawne

Jean-Christophe (1904 - 1912), Journey's End: The Burning Bush (1911)
Context: "Thou art not alone, and thou dost not belong to thyself. Thou art one of My voices, thou art one of My arms. Speak and strike for Me. But if the arm be broken, or the voice be weary, then still I hold My ground: I fight with other voices, other arms than thine. Though thou art conquered, yet art thou of the army which is never vanquished. Remember that and thou wilt fight even unto death."
"Lord, I have suffered much!"
"Thinkest thou that I do not suffer also? For ages death has hunted Me and nothingness has lain in wait for Me. It is only by victory in the fight that I can make My way. The river of life is red with My blood."
"Fighting, always fighting?"
"We must always fight. God is a fighter, even He Himself. God is a conqueror. He is a devouring lion. Nothingness hems Him in and He hurls it down. And the rhythm of the fight is the supreme harmony. Such harmony is not for thy mortal ears. It is enough for thee to know that it exists. Do thy duty in peace and leave the rest to the Gods."

X, 30
Meditations (c. 121–180 AD), Book X
Context: When thou art offended at any man's fault, forthwith turn to thyself and reflect in what manner thou doest error thyself... For by attending to this thou wilt quickly forget thy anger, if this consideration is also added, that the man is compelled; for what else could he do? or, if thou art able, take away from him the compulsion.

“Man know thyself; then thou shalt know the Universe and God.”
As quoted in Fragments of Reality: Daily Entries of Lived Life (2006) by Peter Cajander, p. 109