Psalm 21:6 “Surely you have granted him unended blessings and made him glad with the joy of your presence.” David recognized his blessings were from his Almighty God.  In recognizing the Source of all his blessings he could only welcome the joy he also lived with.  You and I paddle the same boat.  All that we have is only because of our Father and He is the Source of our joy.  Our response for blessings is joy just as our response for His loving grace can only in return be to live a life He would have us live.