John the Apostle
1 John 3:21BSB·traditional attribution

Beloved, if our hearts do not condemn us, we have confidence before God,

John Calvin Reformed @genevareformer

21 If our heart condemns not I have already explained that this refers not to hypocrites nor to the gross despisers of God. For how muchsoever the reprobate may approve of their own lives, yet the Lord, as Solomon says, weigheth their hearts. (Proverbs 16:2.) This balance of God, by which he tries men, is such, that no one can boast that he has a clean heart.

Matthew Henry Presbyterian @wholebiblehenry

The apostle, having intimated that there may be, even among us, such a privilege as an assurance or sound persuasion of heart towards God, proceeds here, I. To establish the court of conscience, and to assert the authority of it: For, if our heart condemn us, God is greater than our heart, and knoweth all things, Jo1 3:20.

Commenting on 1 John 3:20-22

John Gill Reformed Baptist @doctorgill

And whatsoever we ask we receive of him,.... According to his promise, Mat 7:7; that is, whatever is asked according to the will of God, in the name of Christ, and for his sake, and in faith, nothing wavering, but believing in God, in his covenant and promises, for these are provisos in the case; and such as ask in this way may exercise an...