Where does this mission come from?  

loving God and loving others

Teacher, which commandment in the law is the greatest?” Jesus said to him, ‘Love the Lord your God with all your heart, with all your soul, and with all your mind.’ This is the first and greatest commandment. The second is like it: ‘Love your neighbor as yourself.’ All the law and the prophets depend on these two commandments.
— Matthew 22:36-40