1 Blessed be the Lord my strength,
which teacheth my hands to war,
and my fingers to fight:
2 My goodness, and my fortress; my high tower, and my deliverer;
my shield, and he in whom I trust;
who subdueth my people under me. – Psalm 144:1-2 (KJV)
The word for goodness signifies mercy. Whoever we may be, and wherever we may be, we need mercy such as can only be found in the infinite God. It is all of mercy that he is any of the other good things to us, so that this is a highly comprehensive title. O how truly has the Lord been mercy to many of us in a thousand ways! He is goodness itself, and he has been unbounded goodness to us. We have no goodness of our own, but the Lord has become goodness to us.
The Treasury of David Vol. 3 (Peabody, Maryland; The Hendrikson Publisher; 1988) p. 355 – Commentary on Psalm 144:2.