John Chrysostom (c. 347–407), On Vainglory and the Education of Children, 22:
Just as an artist who paints pictures and portraits exercises great care in his work, so each of you, mothers and fathers, must be attentive to these wonderful images [children]. Each day, a painter adds what is necessary to the picture. Sculptors do the same, removing excess stone and adding what is lacking. You should do the same: as makers of images, devote all your time to the task of fashioning wonderful images for God. Remove the excess; add what is lacking. Each day, examine the images closely. Cultivate the natural excellence that each one has, removing what is by nature inferior. Take care to root out first the thought of licentiousness, for sex is especially troublesome to young souls. Instead, before they encounter this temptation, teach them to be sober, vigilant, watchful in prayer, and to place everything that is said and done under the sign of the cross.