The following is the first paragraph of the preface to the Book of Proverbs in my Bible:
The key word in Proverbs is wisdom, “the ability to live life skillfully.” A godly life in an ungodly world, however, is no simple assignment. Proverbs provides God’s detailed instructions for His people to deal successfully with the practical affairs of everyday life: how to relate to God, parents, children, neighbors, and government. Solomon, the principal author, uses a combination of poetry, parables, pithy questions, short stories, and wise maxims to give in strikingly memorable form the common sense and divine perspective necessary to handle life’s issues.
Trust in the Lord with all thine heart; and lean not unto thine own understanding. In all thy ways acknowledge him, and he shall direct thy paths.
A merry heart doeth good like a medicine: but a broken spirit drieth the bones.
Paraphrased “Laugh a little it does the body good!”