'Grateful' in the Bible

Bless our God, O peoples,And make the sound of His praise be heard abroad,

I will exalt You, my God, O King,And [with gratitude and submissive wonder] I will bless Your name forever and ever.

He does not thank the servant just because he did what he was ordered to do, does he?

But if anyone loves God [with awe-filled reverence, obedience and gratitude], he is known by Him [as His very own and is greatly loved].