The baptism of the Holy Spirit

Psalm 1:1 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; 2 but his delight is in the law of the LORD, and on his law he meditates day and night. 
3 He is like a tree planted by streams of water that yields its fruit in its season, and its leaf does not wither. In all that he does, he prospers.

M'Chenney Bible reading plan: http://www.edginet.org/mcheyne/year_classic_single_a4.pdf

What we the reason and the motivation of what Jesus did?