What does Psalm 103:6 mean?

Prior verses contained David's personal reasons for honoring God. Here, David moves from personal to general statements about God's governance. His direction of the world is another reason for Israel to praise Him.

David states that God performs righteous deeds and justice. Israel had many opportunities to observe God's righteous deeds. From His call of Abraham to the time of David, God performed righteous acts on behalf of the nation. He delivered the nation from slavery in Egypt (Judges 6:9) and provided miraculously for the Israelites in the wilderness by supplying water from a rock (Exodus 17:1–6), manna from heaven (Exodus 16:15–16), and abundant quail for meat (Exodus 16:13).

God also judged Israel's wicked enemies and punished those who violated His covenant. He displayed His justice for His oppressed people by rescuing them from slavery in Egypt (Exodus 20:2) and later, in the era of the Judges, by repeatedly delivering them from their oppressive enemy nations. He had also commanded His people to show kindness and generosity to the poor (Deuteronomy 15:7–11).