From their infancy the youth need to have a firm barrier built up between them and the world, that its corrupting influence may not affect them. Parents must exercise unceasing watchfulness, that their children be not lost to God. The vows of David, recorded in the 101st psalm, should be the vows of all upon whom rest the responsibilities of guarding the influences of the home. The psalmist declares: “I will set no wicked thing before mine eyes: I hate the work of them that turn aside; it shall not cleave to me. A froward heart shall depart from me: I will not know a wicked person. Whoso privily slandereth his neighbor, him will I cut off: him that hath an high look and a proud heart will not I suffer. Mine eyes shall be upon the faithful of the land, that they may dwell with me: he that walketh in a perfect way, he shall serve me. He that worketh deceit shall not dwell within my house: he that telleth lies shall not tarry in my sight.” Psalm 101:3-7. CT 119.1
The youth should not be left to learn good and evil indiscriminately, the parents thinking that at some future time the good will predominate and the evil lose its influence. The evil will increase faster than the good. It is possible that the evil which children learn may be eradicated after many years, but who would trust to this? Whatever else they neglect, parents should never leave their children free to wander in the paths of sin. CT 119.2