All is flux, nothing stays still.
Man is most nearly himself when he achieves the seriousness of a child at play
Much learning does not teach understanding.
The eyes are more exact witnesses than the ears.
The road up and the road down is one and the same.
A man's character is his fate.
Nothing endures but change.
No man ever steps in the same river twice, for it's not the same river and he's not the same man.
You could not step twice into the same rivers; for other waters are ever flowing on to you.
There is nothing permanent except change.