Beware of the fury of the patient man. John Dryden
Beware of false knowledge; it is more dangerous than ignorance. George Bernard Shaw
Beware of exquisite language. The language should be simple and elegant. Anton Chekhov
Beware of the anger of a patient man. Irish Proverb
Beware of Greeks bearing gifts. English Proverb
Beware of the man to whom you have done a good turn. Lebanese Proverb