„Do you know because I tell you so, or do you know, do you know.“

— Gertrude Stein
„Now I know the things I know, and I do the things I do; and if you do not like me so, to hell, my love, with you!“
— Dorothy Parker
„I know you'll do what's best for Annabeth.""How can you be sure?""Because she'd do the same for you.“
— Rick Riordan
„"I know you don't have to help us out-it's a favor-""Stop. I don't do favors, Alec. I do things for you because-- well, why do you think I do them?“
— Cassandra Clare
„It is said that if you know your enemies and know yourself, you will not be imperiled in a hundred battles; if you do not know your enemies but do know yourself, you will win one and lose one; if you do not know your enemies nor yourself, you will be imperiled in every single battle.“
— Sun Tzu
„I don't know. It's been terribly hard for me. How do I know you won't do it again?''Nobody is ever quite sure of what they will do. You aren't sure what you might do.“
— Charles Bukowski