Solomon wrote most of the book of Proverbs. The Lord said to Solomon, "...I will give you a wise and discerning heart, so that there will never have been anyone like you, nor will there ever be." (1 Kings 3:12).
The book of Proverbs contains good, practical advice for harmonious living. Some self-help books (such as, "How to Make Friends and Influence People") take many of their ideas from the book of Proverbs!