Charles H. Spurgeon on Psalms 18:50

This is the winding up verse into which the writer throws a fulness of expression, indicating the most rapturous delight of gratitude. "Great deliverance." The word "deliverance" is plural, to show the variety and completeness of the salvation; the adjective "great" is well placed if we consider from what, to what, and how we are saved. All this mercy is given to us in our King, the Lord's Anointed, and those are blessed indeed who as his seed may expect mercy to be built up for evermore. The Lord was faithful to the literal David, and he will not break his covenant with the spiritual David, for that would far more involve the honour of his crown and character.

The Psalm concludes in the same loving spirit which shone upon its commencement; happy are they who can sing on from love to love, even as the pilgrims marched from strength to strength.