Origen

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Or he increased in spirit, remaining not in the same measure in which he had begun, but the Spirit was ever growing in him. His will ever tending to better things, was making its own advances, and his mind ever contemplating something more divine, while his memory was exercising itself, that it might lay up more and more things in its treasury, and more firmly retain them. But he adds, And he waxed strong. For human nature is weak, as we learn, the flesh is weak. (Matt. 26:41.) It must therefore be made strong by the Spirit, for the Spirit is ready. Many wax strong in the flesh, but the wrestler of God must be strengthened by the Spirit that he may crush the wisdom of the flesh. He retires therefore to escape the noise of cities, and the thronging of the people. For it follows, And he was in the deserts. Where the air is purer, the sky more clear, and God a closer friend, that as the time had not yet arrived for his baptism and preaching, he might have leisure for praying, and might hold converse with the angels, calling upon God and fearing Him, saying, Behold, here am I.