Psalm 103

Psalm 103:1
Bless the Lord, O my soul,
and all that is within me,
bless his holy name!

This from the treasure of David by Spurgeon:

The Psalmist strikes the best keymote when he begins with stirring up his inmost self to magnify the Lord. He soliloquizes, holds self-communion and exhorts himself, as though he felt that dulness would all too soon steal over his faculties, as, indeed, it will over us all, unless we are diligently on the watch.

 O God, but thy saints shall bless thee." Our very life and essential self should be engrossed with this delightful service, and each one of us should arouse his own heart to the engagement. Let others forbear if they can: "Bless the Lord, O MY soul." Let others murmur, but do thou bless. Let others bless themselves and their idols, but do thou bless the LORD. Let others use only their tongues, but as for me I will cry, "Bless the Lord, O my soul."

And all that is within me, bless his holy name. Many are our faculties, emotions, and capacities, but God has given them all to us, and they ought all to join in chorus to his praise. Half-hearted, ill-conceived, unintelligent praises are not such as we should render to our loving Lord.

"All that is within me, etc. Let your conscience "bless the Lord," by unvarying fidelity. Let your judgment bless Him, by decisions in accordance with his word. Let your imagination bless him, by pure and holy musings. Let your affections praise him, by loving whatsoever he loves. Let your desires bless him, by seeking only his glory. Let your memory bless him, by not forgetting any of his benefits. Let your thoughts bless him, by meditating on his excellencies. Let your hope praise him, by longing and looking for the glory that is to be revealed. Let your every sense bless him by its fealty, your every word by its truth, and your every act by its integrity." John Stevenson