What does Proverbs 3:8 mean?

Solomon tells his student what the results will be if the student trusts in the Lord wholeheartedly, acknowledges the Lord in everything, fears the Lord, and turns his back on evil. Good health and refreshing are the normal results of a good relationship with the Lord.

Exodus 15:22–25 describes a situation in which the Israelites were desperate for water. They grumbled when they found water at Marah, but could not drink it because it was bitter. However, the Lord cured the water and promised, "If you will diligently listen to the voice of the LORD your God, and do that which is right in his eyes, and give ear to his commandments and keep all his statutes, I will put none of the diseases on you that I put on the Egyptians, for I am the LORD, your healer" (Exodus 15:26). Next, the people of Israel came to a refreshing oasis, where they set up camp.

Although the Lord's promise of healing was given to the ancient nation of Israel, good health and vitality is more likely to come to those who maintain a close relationship with the Lord. Following God's commands makes one less likely to experience the diseases, accidents, and consequences which often befall those who lead a decadent life.