The truly happy person doesn't follow wicked advice, doesn't stand on the road of sinners, and doesn't sit with the disrespectful.
References for Psalms 1:1
Instead of doing those things, these persons love the LORD's Instruction, and they recite God's Instruction day and night!
They are like a tree replanted by streams of water, which bears fruit at just the right time and whose leaves don't fade. Whatever they do succeeds.
That's not true for the wicked! They are like dust that the wind blows away.
And that's why the wicked will have no standing in the court of justice— neither will sinners in the assembly of the righteous.
The LORD is intimately acquainted with the way of the righteous, but the way of the wicked is destroyed.