The first of all the commandments is, ‘Hear, Israel, The Lord our God is the only Lord. You shall therefore love the Lord your God with all your heart, and with all your soul, and with all your mind, and with all your strength:’ this is the first commandment. And the second is like it, that is, 'You shall love your neighbour as yourself.’ There is no other commandment greater than these.
Mark 12:29-31, THE HOLY BIBLE