Every baby starts life as a little savage!
"Surely I was sinful at birth, sinful from the time my mother conceived me!" Psalm 51:5
"Every baby starts life as a little savage. He is completely selfish and self-centered: he wants what he wants—his bottle, his mother's attention, his playmate's toys, his uncle's watch, or whatever. Deny him these and he seethes with rage and aggressiveness which would be murderous were he not so helpless. He is dirty; he has no morals, no knowledge and no developed skills. This means that all children, not just certain children, but all children are born delinquent. If permitted to continue in their self-centered world of infancy, given free reign to their impulsive actions to satisfy each want—every child would grow up a criminal, a killer, a thief, and a rapist." (Reb Bradley, "Biblical Insights into Child Training")
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"Remember that children are born with a decided bias toward evil, and therefore if you let them choose for themselves, they are certain to choose wrong. The mother cannot tell what her tender infant may grow up to be—tall or short, weak or strong, wise or foolish—all is uncertain. But one thing the mother can say with certainty—he will have a corrupt and sinful heart! It is natural for us to do wrong. Our hearts are like the earth on which we tread—let it alone, and it is sure to bear weeds!" (J. C. Ryle)
"Every inclination of his heart is evil from childhood." Genesis 8:21