Psalm 1 is the gateway to the entire book of Psalms.
Psalm 1 asks us the question are we going to choose intoxication with life, a fools life, or are we going to seek guidance and wisdom form God. When the Psalmist points out that we must meditate on the law day and night he means precisely that. We must think and consider God all day in all that we do.
Where are you in this way of life? Do you think of Christ, God the Father and the Holy Spirit at all during your day? If not you need to repent and seek God!
Psalm 1: 1-6
1 Blessed is the one who does not walk in step with the wicked or stand in the way that sinners take or sit in the company of mockers,
2 but whose delight is in the law of the LORD, and who meditates on his law day and night.
3 That person is like a tree planted by streams of water, which yields its fruit in season and whose leaf does not wither— whatever they do prospers.
4 Not so the wicked! They are like chaff that the wind blows away.
5 Therefore the wicked will not stand in the judgment, nor sinners in the assembly of the righteous.
6 For the LORD watches over the way of the righteous, but the way of the wicked leads to destruction.