Thematic Bible: Summed up by Christ

One of them, a teacher of the law of Moses, asked Him a question [in an attempt] to test Him. "Teacher, which one is the greatest commandment in the law of Moses?" he asked. Jesus replied, [Deut. 6:5] "'You must love the Lord your God with all your heart, with all your soul and with all your mind.' read more.
This is the foremost and greatest commandment. A second one, similar to it is [Lev. 19:18], 'You must love your neighbor the same way that you love yourself.' The entire law of Moses and the prophets hinge on these two commandments."