The strongest symptom of wisdom in man is his being sensible of his own follies.

La Rochefoucauld

?The foolish sayings of a rich man pass for wise ones.

Spanish proverbs

The only man I know who behaves sensibly is my tailor; he takes my measurements anew each time he sees me. The rest go on with their old measurements and expect me to fit them.

George Bernard Show

The heart of the wise man lies quiet like limpid water.

Cameroonian

All truly wise thoughts have been thought already thousands of times; but to make them truly ours, we must think them over again honestly, till they take root in our personal experience.

Johann Wolfgang von Goethe