This first psalm highlights the blessing that comes with godly wisdom.
This teaches us that our thought life is important, as it influences all that we say and do.
Quite simply, what we think becomes how we feel, and then our actions flow from our feelings. We live in a world that generally does not follow God's ways. It is so easy to absorb worldly attitudes and ways of thinking which can be contrary to God’s word.
More than passive consumption, the psalmist argues that the active curation of our minds—what we listen to and meditate on—is the cornerstone of a wise and blessed life.