Integrity has no need of rules.
~ Albert Camus
No one can disgrace us but ourselves.
~ Josiah Holland
One lie will destroy a whole reputation for integrity.
~ Baltasar Gracian, in The Art of Worldly Wisdom
Integrity without knowledge is weak and useless, and knowledge without integrity is dangerous and dreadful.
~ Samuel Johnson, in Rasselas
The liar’s punishment is not in the least that he is not believed, but that he cannot believe anyone else.
~ George Bernard Shaw