Oecumenius

Beloved, if our heart does not condemn us, we have confidence toward God; and whatever we ask, we receive from Him, because we keep His commandments and do those things that are pleasing in His sight. Therefore, after we have prepared ourselves in such a way, beloved, that we are not condemned by ourselves, namely in being truthful with one another, we will have confidence towards God: through which confidence, whatever we ask, we will receive entirely from Him. Why? …

Commentary on 1 John ↗

Augustine of Hippo

"Beloved, if our heart think not ill of us, we have confidence towards God:" - What meaneth, "If our heart think not ill"? If it make true answer to us, that we love and that there is genuine love in us: not feigned but sincere; seeking a brother's salvation, expecting no emolument from a brother, but only his salvation - "we have confidence toward God: and whatsoever we ask, we shall receive of Him, because we keep His commandments." - Therefore, not in the sight of men, but where God Himself seeth, in the heart - "we have …

Ten Homilies on 1 John 6 ↗

Bede

Beloved, if our heart does not reproach us, etc. If it truthfully answers us that we love, and that genuine love is in us, and not feigned, but sincere, seeking the brother's salvation, expecting no gain from the brother except his salvation; likewise, if our heart does not reproach us, notably when we say in prayer: Forgive us our debts, as we also forgive our debtors (Matthew VI), we have confidence towards God, not in the sight of men, but where God Himself sees in the heart.

Commentary on the Catholic Epistles ↗