Psalms 28:6

Blessed be the LORD, because he hath heard the voice of my supplications.

Blessed be the Lord because He has heard the voice of supplications for help and answered prayers, and for that hearing He is worthy of blessing and praise. The gratitude is for God's answering response, expressed together with thanksgiving for restored health and strength. The psalm sets this verse within its testimony to the rich blessings God bestows on His people. It also highlights their poor response and poor return for all those benefits.