The book of Proverbs speaks much about being prudent. A prudent person has basic common sense. He has wisdom to know when to say something and what to say. He also has wisdom to know when it is best not to say something. Prudence is very valuable because it can keep one from making a bad decision that could cost him his life.
The prudent is wise enough to know when to get out of the way of evil men. The way to become a prudent or a wise person is by continual prayer, and by reading, studying, memorizing and meditating on Scripture as much as possible. One book that you should study thoroughly is Proverbs. It has more wisdom and tips on how to live a holy life than any other book in the Bible.