Know yourself. Here are some proverbs and quotes about self-knowledge.
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A friend's eye is a good mirror.A real friend will tell you the truth about yourself.
A man is never the best judge of his own position.Anthony Trollope
Source: The Warden
Assume you aren't "normal" and that other people aren't idiots.Hans Rosling
Be yourself; everyone else is already taken.Oscar Wilde
Everyone knows where his own shoe pinches!Anthony Trollope
Source: The Warden
For years and years and years, I thought my brain was the most important organ of my body, until one day I thought, hmm. Look who’s telling me that!George Carlin
I can resist everything except temptation.Oscar Wilde
I'm afraid I can't explain myself, sir. Because I am not myself, you see?Lewis Carroll
Source: Alice in Wonderland
If I couldn't talk to myself, I'd have no way of knowing what I was thinking.Daniel Dennett
If you have a good friend, you don't need a mirror.
In spite of everything I shall rise again: I will take up my pencil, which I have forsaken in my great discouragement, and I will go on with my drawing.Vincent van Gogh
It is never too late to give up our prejudices.Henry David Thoreau
Knowing others is wisdom, knowing yourself is Enlightenment.Laozi
Let him that would move the world first move himself.Socrates
Life is a matter of choices, and every choice you make makes you.John C. Maxwell
My one regret in life is that I am not someone else.Woody Allen
Our deeds determine us, as much as we determine our deeds.George Eliot
Self-knowledge is the first step to maturity.Jane Austen
The readiness is all.William Shakespeare
Source: Hamlet
The real key to health and happiness and success is self knowledge.Laozi
To learn about other people is science, to learn to know yourself is intelligence.
Trust yourself, you know more than you think you do.Benjamin Spock
We need to challenge our own thinking.Elliot Aronson
We shouldn't deceive ourselves about self-deception.Steven Pinker
Source: The Better Angels of Our Nature: Why Violence Has Declined
Where so many hours have been spent in convincing myself that I am right, is there not some reason to fear I may be wrong?Jane Austen
Source: Sense and Sensibility
Why am I me and not someone else?(unknown author)
You blows who you is.Louis Armstrong