Human beings seek happiness naturally, Aristotle explains to us in Nicomachean Ethics, but the search for happiness is a mistake, those who seek it ultimately do not find it or, in the best of cases, it is reduced to simple passing moments. The Bible teaches us that human beings are subject to ethical laws and that we have to choose between two paths. Happiness in its true form way belongs to the people who are precise and accurate, that is to say to those who choose the path of truth or assertiveness, because these people are the ones who control the negative and positive effects of the law of harvest and sowing explained by the Bible: "Do not be deceived: God cannot be mocked. A man reaps what he sows" Galatians 6:7.
Psalm 19 shows us what is perhaps the fundamental problem of ethics in man, we have to choose between truth (precision and accuracy) and error. Following also the teaching of Psalm 1, the psalm of the two paths; truth or assertiveness on the one hand, and error or sin on the other, these are paths and discernments (mentalities), for the first immortality (gift of longevity) and eternal life (contemplative activity), for the latter ruin: "For the LORD watches over the way of the righteous, but the way of the wicked leads to destruction" Psalm 1:6.
The law of God is complete and the source of all wisdom tells us the Psalm 19, those who meditate on it avoid error and find knowledge, light, and joy: "The law of the LORD is perfect, refreshing the soul. The statutes of the LORD are trustworthy, making wise the simple. The precepts of the LORD are right, giving joy to the heart. The commands of the LORD are radiant, giving light to the eyes" Psalm 19:7-8. Is in the nature of the sensible man to avoid error and seek the path of righteousness: "But who can discern their own errors? Forgive my hidden faults. Keep your servant also from willful sins; may they not rule over me. Then I will be blameless, innocent of great transgression" Psalm 19:12-13.