If our heart, or our conscience, condemn us, viz. in plain things, (as this of loving our brother is), and wherein the mind of God is evidently the same with our own conscience; his superiority, to whom our conscience is but an under-judge, ought much more to awe us, especially considering how much more he knows of us than we do of ourselves; as 1 Corinthians 4:4.
Related Commentaries of 1 John 3:20
1 John 3:20
20 For if our heart condemn us, God is greater than our heart, and knoweth all things.