God shows mercy to his people (Psalm 51:1). God is compassionate (Psalm 25:6). God is slow to become angry (Psalms 103:8; 145:8). God is full of loving devotion and faithfulness (Hebrew khesed and ’emeth; Psalm 143:1)
This verse repeats a theme first expressed in Exodus 34:7; Numbers 14:18 (compare Psalms 103:8; 145:8; Nehemiah 9:17; Joel 2:13; Jonah 4:2).