Answer:
When asked which is the greatest commandment, Jesus replied,
"Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind. This is the first and greatest commandment. And the second is like unto it. Thou shalt love thy neighbour as thyself. On these two commandments hang all the law and the prophets." (Mt 22:37-40)
hope this helped :)