One must always be careful of books," said Tessa, "and what is inside them, for words have the power to change us. Cassandra Clare
Be careful of success; it has a dark side. Robert Redford
be careful of monsters with teeth. Harlan Ellison
Be careful of the words you say each day, make sure each is nice and sweet, because may be in the days ahead, there will be some you'll have to eat. African Proverb
Be careful of your enemy once and of your friend a thousand times, for a double crossing friend knows more evil. Arabic Proverb
Be careful of what you say as it can hurt more than a knife. Indonesian Proverb