Ecclesiastes 12:13, amp

All has been heard; the end of the matter is: Fear God [revere and worship Him, knowing that He is] and keep His commandments, for this is the whole of man [the full, original purpose of his creation, the object of God's providence, the root of character, the foundation of all happiness, the adjustment to all inharmonious circumstances and conditions under the sun] and the whole [duty] for every man.