Matthew 7:21 - Albert Barnes' Notes on the Bible

Not every one that saith ... - The Saviour goes on to say that many, on the ground of a mere profession such as he had just referred to, would claim admittance into his kingdom. Many would plead that they had done miracles, and preached or prophesied much, and on the ground of that would demand an entrance into heaven. The power of working miracles had no necessary connection with piety. God may as well, if he chooses, give the power of raising the dead to a wicked man, as the skill of healing to a wicked physician. A miracle is a display “of his own power” through the medium of another. An act of healing the sick is also a display of “his power” through the agency of another. In neither of these cases is there any necessary connection with moral character. So of preaching or prophesying. God may use the agency of a man of talents, though not pious, to carry forward His purposes. Saving power on the mind is the work of God, and he may convey it by any agency which he chooses. Accordingly, many may be found in the day of judgment who may have been endowed with powers of prophecy or miracle, as Balaam or the magicians of Egypt; in the same way as many people of distinguished talents may be found, yet destitute of piety, and who will be shut out of his kingdom. See Matthew 7:21; 1 Corinthians 1:26; 1 Corinthians 13:1-3. In this last place Paul says that, though he spoke with the tongue of angels, and had the gift of prophecy, and could remove mountains, and had nor charity or love, all would be of no avail. See the notes at 1 Corinthians 13:1-3.