Don’t worry — the Kesslers know that parents can’t possibly be perfect. But they do believe that imperfect parents can raise their children on the foundation of a perfect system: the laws of nature, in particular the principle of causality — that every action causes an equal and opposite reaction. The Kesslers show parents practical ways to teach their kids — from infancy to young adulthood — that negative actions cause negative results, and positive actions cause positive results, equippi...