One can be absolutely truthful and sincere even though admittedly the most outrageous liar.
A liar is always lavish of oaths
No man has a good enough memory to be a successful liar
The best liar is he who makes the smallest amount of lying go the longest way
A man is never more truthful than when he acknowledges himself a liar
The liar's punishment is not in the least that he is not believed, but that he cannot believe anyone else
No one lies so boldly as the man who is indignant


On Anger: "For every minute you remain angry, you give up sixty seconds of peace of mind."
On Destiny: "Our destiny exercises its influence over us even when, as yet, we have not learned its nature: it is our future that lays down the law of our today."
Human, All Too Human
On Friendship: "A crowd is not company; and faces are but a gallery of pictures; and talk but a tinkling cymbal, where there is no love."