And he answering said, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy strength, and with all thy mind; and thy neighbour as thyself. Thou shalt love the Lord - See this important subject explained at large, on Matthew 22:37-40 (note).
Thy neighbor as thyself - See the nature of self-love explained, on Matthew 19:19 (note).