Commentaries:
Jamieson, Fausset, and Brown
doeth truth—whose only object in life is to be and do what will bear the light. Therefore he loves and "comes to the light," that all he is and does, being thus thoroughly tested, may be seen to have nothing in it but what is divinely wrought and divinely approved. This is the "Israelite, indeed, in whom is no guile."
not to condemn, etc.—A statement of vast importance. Though "condemnation" is to many the issue of Christ's mission (John 3:19), it is not the object of His mission, which is purely a saving one.
Other Jamieson, Fausset, and Brown entries containing John 3:21:
Proverbs 12:22
Jeremiah 29:8
Ephesians 5:11
1 John 1:6
3 John 1:12
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