And whatsoever we ask, we receive of him, because we keep his commandments, and do those things that are pleasing in his sight.
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Augustine of Hippo
AD 430
Therefore, not in the sight of men, but where God Himself sees, in the heart— we have confidence, then, towards God: and whatsoever we ask, we shall receive of Him: howbeit, because we keep His commandments. What are His commandments? Must we be always repeating? A new commandment give I unto you, that you love one another. John 13:34 It is charity itself that he speaks of, it is this that he enforces. Whoso then shall have brotherly charity, and have it before God, where God sees, and his heart being interrogated under righteous examination make him none other answer than that the genuine root of charity is there for good fruits to come from; that man has confidence with God, and whatsoever he shall ask, he shall receive of Him, because he keeps His commandments.
Here a question meets us: for it is not this or that man, or you or I that come in question—for if I have asked any thing of God and receive it not, any person may easily say of me, He has not charity: and of any man soever ...