"Scripture tells us, 'The heart is deceiful above all things, and desperately wicked: who can know it?' (Jeremiah 17:9). So we are aware that sheltering our children will not keep them from being sinful. However, we also know that external temptations to sin may reinforce the sin originating in the heart to a point beyond the child's current level of self-control, resulting in sinful thoughts or actions."
~from Keeping Our Children's Hearts by Steven and Teri Maxwell