Blessed are they that do his commandments, that they may have right to the tree of life, and may enter in through the gates into the city. Blessed are they that do his commandments - They are happy who are obedient.
That they may have right to the tree of life - The original is much more expressive, Ἱνα εσται ἡ εξουσια αυτων επι το ξυλον της ζωης· That they may have authority over the tree of life; an authority founded on right, this right founded on obedience to the commandments of God, and that obedience produced by the grace of God working in them. Without grace no obedience; without obedience no authority to the tree of life; without authority no right; without right no enjoyment: God's grace through Christ produces the good, and then rewards it as if all had been our own.