Jesus taught, "Ye have heard that it hath been said, Thou shalt love they neighbour, and hate thine enemy. But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you." (Matthew 5:43-44)
Concerning the two greatest commandments, he taught, "That shalt love the Lord they God with all they heart, and with all thy soul, and with all they mind. This is the first and great commandment. And the second is like unto it, Thou shalt love they neighbour as thyself." (Matthew 22:37-39)
And lastly he taught, "This is my commandment, That ye love one another; as I have loved you. Greater love hath no man than this, that a man lay down his life for his friends." (John 15:12-13)
To summarize, we are to love our enemies like we love our neighbors. We are to love our neighbors as we love ourselves. We are to love ourselves and our neighbors as Jesus loved his disciples and us.
