The greatest commandment

You shall love the Lord your God with your whole heart,
your whole soul, and with all your mind. 
This is the greatest and first commandment. 
The second is like it; you shall love your neighbour as yourself. 

(according to Mathew) When Jesus is asked which is the greatest commandment of the Law we can read his reply in Mathew (Mt 22,36 40) and Mark (MK 12,29 31).