Theophylact of Bulgaria
See how He has enumerated all the powers of the soul; for there is a 1living power in the soul, which He explains, when He says, With all thy soul, and to this belong anger and desire, all of which He will have us give to Divine love. There is also another power, which is called natural, to which belong nutriment and growth, and this also is all to be given to God, for which reason He says, With all thy heart. There is also another power, the rational, which He calls the mind, and that too is to be given whole to God.
He says that it is like, because these two commandments are harmonious one with the other, and mutually contain the other. For he who loves God, loves also His creature; but the chief of His creatures is man, wherefore he who loves God ought to love all men. But he who loves his neighbour, who so often offends him, ought much more to love Him, who is ever giving him benefits. And therefore on account of the connection between these commandments, He adds, There is none other commandment greater than these.
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It goes on: And the Scribe said unto him, Well, Master, thou hast said the truth: for there is one God, and there is none other but he: and to love him with all the heart, and with all the soul, and with all the understanding, and with all the strength, and to love his neighbour as himself, is more than all whole burnt offerings and sacrifices.
By which He shews that he was not perfect, for He did not say, Thou art within the kingdom of heaven, but, Thou art not far from the kingdom of God.