What does Psalm 25:6 mean?

In this verse David reflects upon Jehovah's favors and love, and observes that they have existed "from of old." "Of old" can be literally translated as "from ancient times" or "from eternity." God has always shown mercy and love, but also, He has always been merciful and loving. These attributes are part of His nature. Likely, David wrote these words while recalling specific instances when God revealed His mercy and love to Israel and to himself.

In his song of redemption following the Red Sea crossing, Moses referred to both God's mercy and love. He exulted: "You have led in your steadfast love the people whom you have redeemed" (Exodus 15:13). Psalm 106 provides clear evidence of God's steadfast love and mercy by telling how He came to Israel's assistance despite that nation's rebellion. The first verse calls upon Israel to "Praise the LORD! Oh give thanks to the LORD, for he is good, for his steadfast love endures forever!"