Habits change into character.

Ovid

Oh, what a bitter thing it is to look into happiness through another man's eyes.

William Shakespeare

Love your enemies, for they tell you your faults.

Benjamin Franklin

To have become a deeper man is the privilege of those who have suffered.

Oscar Wilde

One who knows how to show and to accept kindness will be a friend better than any possession.

Sophocles

A clear conscience is the sure sign of a bad memory.

Mark Twain