I will give thanks to the Lord with my whole heart;
I will recount all of your wonderful deeds.
I will be glad and exult in you;
I will sing praise to your name, O Most High. Psalm 9:1-2
Charles H. Spurgeon writes in The Treasury of David:
It sometimes needs all our determination to face the foe, and bless the Lord in the teeth of his enemies; vowing that whoever else may be silent we will bless his name; here, however, the overthrow of the foe is viewed as complete, and the song flows with sacred fulness of delight. It is our duty to praise the Lord; let us perform it as a privilege. Observe that David’s praise is all given to the Lord. Praise is to be offered to God alone; we may be grateful to the intermediate agent, but our thanks must have long wings and mount aloft to heaven. With my whole heart. Half heart is no heart.
Knowing God through His Word ... Day by Day 