A knight errant who turns mad for a reason deserves neither merit nor thanks. The thing is to do it without cause. Miguel de Cervantes
This was the true nature of consciousness and the meaning of matter, that ultimately both were one substance without cause or control outside itself. David Zindell
Wherefore not without cause has one of your own followers asked, "If God is, whence come evil things? If He is not, whence come good?" Anicius Manlius Severinus Boethius
A fool may be known by six things anger, without cause speech, without profit change, without progress inquiry, without object putting trust in a stranger, and mistaking foes for friends. Traditional Proverb
Nobody hates anybody without cause. African Proverb
Make no one an enemy without cause. Turkish Proverb