Always count the cost.
Beware of the man who works hard to learn something, learns it, and finds himself no wiser than before, Bokonon tells us. He is full of murderous resentment of people who are ignorant without having come by their ignorance the hard way.
Take care that you do not despise one of these little ones; for I tell you, in heaven their angels continually see the face of my Father. [Matthew 18:10]
Of all the thirty-six alternatives, running away is best.
Vigilance is the virtue of vice.
The torment of precautions often exceeds often exceeds the dangers to be avoided. It is sometimes better to abandon one's self to destiny.
Don't dance on a volcano.
Caution is the confidential agent of selfishness.
Look twice before you leap.
Beware of one who has nothing to lose.
Whenever our neighbor's house is on fire, it cannot be amiss for the engines to play a little on our own.