Context: 7 "The law of the Lord is perfect, refreshing the soul. The statutes of the Lord are trustworthy, making wise the simple. 8 The precepts of the Lord are right, giving joy to the heart. The commands of the Lord are radiant, giving light to the eyes." 9 "The fear of the Lord is pure, enduring forever. The decrees of the Lord are firm, and all of them are righteous." (NIV)
Psalms 19:7
ESV - 7 The law of the Lord is perfect, reviving the soul; the testimony of the Lord is sure, making wise the simple.
For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.