Not every one that says unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that does the will of my Father who is in heaven.
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Augustine of Hippo
But seeing that, however pure an eye one may have, i.e. with however single and sincere a heart one may live, he yet cannot look into the heart of another: whatever things could not have become apparent in deeds or words, are disclosed by trials. Now trial is twofold; either in the hope of obtaining some temporal advantage, or in the terror of losing it. And especially must we be on our guard, lest, when striving after wisdom, which can be found in Christ alone, in whom are hid all the treasures of wisdom and knowledge; — we must be on our guard, I say, lest, under the very name of Christ, we be deceived by heretics, or by any parties whatever defective in intelligence, and lovers of this world. For on this account He adds a warning, saying, Not every one that says unto Me, Lord, Lord, shall enter into the kingdom of heaven; but he that does the will of My Father which is in heaven, he shall enter into the kingdom of heaven: lest we should think that the mere fact of one saying to our Lord, Lord, Lord, belongs to those fruits; and from that he should seem to us to be a good tree. But those are the fruits, to do the will of the Father who is in heaven, in the doing of which He has condescended to exhibit Himself as an example.
But the question may fairly be started, how with this sentence the statement of the apostle is to be reconciled, where he says, No man speaking by the Spirit of God calls Jesus accursed; and no man can say that Jesus is the Lord, but by the Holy Ghost: for neither can we say that any who have the Holy Spirit will not enter into the kingdom of heaven, if they persevere onwards to the end; nor can we affirm that those who say, Lord, Lord, and yet do not enter into the kingdom of heaven, have the Holy Spirit. How then does no one say that Jesus is the Lord, but by the Holy Ghost, unless it is because the apostle has used the word say here in a strict and proper sense, so that it implies the will and understanding of him who says? But the Lord has used the word which He employs in a general sense: Not every one that says unto Me, Lord, Lord, shall enter into the kingdom of heaven. For he also who neither wishes nor understands what he says, seems to say it; but he properly says it, who gives expression to his will and mind by the sound of his voice: just as, a little before, what is called joy among the fruits of the Spirit is called so in a strict and proper sense, not in the way in which the same apostle elsewhere uses the expression, Rejoices not in iniquity: as if any one could rejoice in iniquity: for that transport of a mind making confused and boisterous demonstrations of joy is not joy; for this latter is possessed by the good alone. Hence those also seem to say it, who neither perceive with the understanding nor engage with the deliberate consent of the will in this which they utter, but utter it with the voice merely; and after this manner the Lord says, Not every one that says unto Me, Lord, Lord, shall enter into the kingdom of heaven. But truly and properly those parties say it whose utterance in speech really represents their will and intention; and it is in accordance with this signification that the apostle has said, No one can say that Jesus is the Lord, but by the Holy Ghost.