“Look well into thyself; there is a source of strength which will always spring up if thou wilt always look.”
Source: Meditations
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Marcus Aurelius 400
Emperor of Ancient Rome 121–180Related quotes

That we do not study to make Use of the established Principles concerning Good and Evil, Chap. xvi.
Bartlett's Familiar Quotations, 10th ed. (1919)

“Continuously thou wilt look at human things as smoke and nothing at all”
X, 31
Meditations (c. 121–180 AD), Book X
Context: Continuously thou wilt look at human things as smoke and nothing at all; especially if thou reflectest at the same time, that what has once changed will never exist again in the infinite duration of time. But thou, in what a brief space of time is thy existence? And why art thou not content to pass through this short time in an orderly way?

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

Tabulae Votivae (Votive Tablets) (1796), "The Key"; tr. Edgar Alfred Bowring, The Poems of Schiller, Complete (1851)
Variant translation:[citation needed]
If you want to know yourself,
Just look how others do it;
If you want to understand others,
Look into your own heart

“When thou findest thyself scorning another, look then at thy own heart and laugh at thy folly.”
Thoughts and Aphorisms (1913), Karma