Clement of Alexandria, on 1Cor 14:20

Truly, then, are we the children of God, who have put aside the old man, and stripped off the garment of wickedness, and put on the immortality of Christ; that we may become a new, holy people by regeneration, and may keep the man undefiled. And a babe, as God's little one, is cleansed from fornication and wickedness. With the greatest clearness the blessed Paul has solved for us this question in his First Epistle to the Corinthians, writing thus: "Brethren, be not children in understanding; howbeit in malice be children, but in understanding be men." And the expression, "When I was a child, I thought as a child, I spoke as a child," points out his mode of life according to the law, according to which, thinking childish things, he persecuted, and speaking childish things he blasphemed the Word, not as having yet attained to the simplicity of childhood, but as being in its folly. "When I became a man," again Paul says, "I put away childish things." It is not incomplete size of stature, nor a definite measure of time, nor additional secret teachings in things that are manly and more perfect, that the apostle, who himself professes to be a preacher of childishness, alludes to when he sends it, as it were, into banishment; but he applies the name "children" to those who are under the law, who are terrified by fear as children are by bugbears; and "men" to us who are obedient to the Word and masters of ourselves, who have believed, and are saved by voluntary choice, and are rationally, not irrationally, frightened by terror.