humanity that God's light — the Torah — is in their hands, and their light — their souls — are in God's hands. God said that if people guard God's light, then God will guard their lights, but if people extinguish God's light, then God will extinguish their lights. For says, "Only take heed to yourself," and then "Keep your soul diligently." This explains , "For if you shall diligently keep." The Midrash thus taught that "if you keep" (God's commandments), then "you shall be kept" (and your souls shall be guarded). A Baraita deduced from the words "you shall make them known to your children, and your children's children" in that if a parent teaches a child Torah, Scripture ascribes merit as though the parent had taught the child, the child's children, and so on, until the end of all time. Rabbi Joshua ben Levi taught that if a parent teaches a child (or some say a grandchild) Torah, Scripture accounts it as if the parent had received the Torah at Mount Sinai, as says, "And you shall make them known to your children and your children's children," and immediately thereafter, says, "The day that you stood before the Lord your God in Horeb." Rabbi Hiyya bar Abba once found Rabbi Joshua ben Levi, who had hurriedly thrown a cloth upon his head, taking his child (or some say grandchild) to the synagogue to study. When Rabbi Hiyya asked Rabbi Joshua what was going on, Rabbi Joshua replied that it was no small thing that the words "you shall make them known to your children and your children's children" are immediately followed by the words "The day that you stood before the Lord your God in Horeb." From then on, Rabbi Hiyya bar Abba did not eat breakfast before revising the previous day's lesson with his child (or some say grandchild) and adding another verse. And Rabbah son of Rav Huna did not eat breakfast until he took his child (or some say grandchild) to school. A Baraita deduced from the proximity of the words "And you shall make them known to your children and your children's children" in to the words "The day on which you stood before the Lord your God in Horeb" in that just as at Mount Sinai, the Israelites stood in dread, fear, trembling, and quaking, so when one teaches Torah to one's child,