What does Proverbs 3:13 mean?

In this verse Solomon describes the one who finds wisdom as "blessed." The word "blessed" means happy. Psalm 1:1 identifies the "blessed" [happy] person as the one who rejects the lifestyle of the wicked but delights in God's Word.

In His sermon on the Mount, Jesus identified the blessed as the poor in spirit, the mourners, the meek, those who hunger and thirst for righteousness, the merciful, the pure in heart, the peacemakers, those who are persecuted for righteousness' sake, and those who are reviled falsely for His sake (Matthew 5:2–11).

Solomon describes wisdom and understanding in Proverbs, but does not explicitly supply definitions. As used across the text, however, wisdom is the ability to act according to accurate knowledge. Understanding, in Proverbs, is insight or intelligence—the ability to know something well enough to pass its value along to others. The acquisition of both wisdom and understanding produces happiness. Believers find life's greatest happiness in knowing and doing God's will and having the insight to determine how they should respond to a godless culture.