<Li> In its fruitfulness; because it is the root of all commandments, and the fulfilling of the law . </Li> <Li> In its virtue and efficacy; because by this alone God reigns in the heart of humans, and humans are united to God . </Li> <Li> In its extent; leaving nothing to the creature, which it does not refer to the Creator . </Li> <Li> In its necessity; being absolutely indispensable . </Li>

You should love god with all your heart