The Greatest Commandment 

"Teacher, which is the greatest commandment in the Law?" 

Jesus replied: 

   "Love the Lord your God with all your heart and with all your soul and with all your mind. This is the first and greatest commandment. And the second is like it: Love your neighbor as yourself. All the Laws and the Prophets hang on these two commandments." - Matthew 22:36-40 

"Of all the commandments, which is the most important?"

    "The most important one," answered Jesus, "is this: Hear, O Israel, the Lord our God, the Lord is one. Love the Lord your God with all your heart and with all your soul and with all your mind and with all your strength. The second is this: Love your neighbor as yourself." - Mark 12:28-31