Those who voluntarily put power into the hands of a tyrant ... must not wonder if it be at last turned against themselves.
Try as one may, it is impossible to deny one's nature
It is one thing to say that something should be done, but quite a different matter to do it.
If you were foolish enough to sing all the summer, you must dance supperless to bed in the winter.
Self-help is the best help
We should find out as much as possible about someone before coming into conflict with him.