The book of Psalms was written and arranged 

  over the course of about 600 years. After all this time and attention, this is the Psalm that starts it all.  A beatitude introduces the Book of Songs.  

Psalm 1
Blessed is the man who walks not in the counsel of the wicked

Nor stands in the way of sinners

Nor sits in the seat of scoffers

But his delight is in the law of the Lord and on his law he meditates day and night.

He is like a tree planted by streams of water

That yields it’s fruit in its season 

And it’s leaf does not wither.

In all that he does, he prospers. 

The wicked are not so

But are like chaff the wind drives away. 

Therefore the wicked will not stand in the judgement 

Nor sinners in the congregation of the righteous

For the Lord knows the way of the righteous

But the way of the wicked will perish. 

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The central question of this Psalm is what directs life.  In the manner that you live and the places or people from whom you seek advice, you choose what directs your way.   There are Ultimately 2 routes to follow. There is the way of the righteous and the way of the wicked. 

The fulfillment of the way of the righteous is not so much a reward as it is a result of having one’s way directed by the Lord.  The second way is really an illusion that has no more merit than chaff that the wind drives away. 

Resource:  Interpretations:  Psalms by James L. Mays