All the dealings of God with them, yea, even those that are afflictive and grievous to the flesh, are done in kindness and faithfulness to them, as being very necessary for them, and tending to their great advantage. His covenant, i.e. the laws or conditions required of them by his covenant; or, as it follows, his testimonies, i.e. his precepts, which are the testimonies or witnesses of God's will, and of man's duty.
Related Commentaries of Psalms 25:10
Psalms 25:10
10 All the paths of the LORD are mercy and truth unto such as keep his covenant and his testimonies.