Wisdom is the most important part of happiness.

There is no happiness where there is no wisdom; No wisdom but in submission to the gods. Big words are always punished, And proud men in old age learn to be wise.

When a man has lost all happiness, he's not alive. Call him a breathing corpse.

A short saying oft contains much wisdom

Rich people without wisdom and learning are but sheep with golden fleeces.

Take these things to heart, my son, I warn you.
All men make mistakes, it is only human.
But once the wrong is done, a man
can turn his back on folly, misfortune too,
if he tries to make amends, however low he's fallen,
and stops his bullnecked ways. Stubbornness
brands you for stupidity - pride is a crime.