The most succinct answer for this is the golden rule: Matthew 7:12 "Therefore all things whatsoever ye would that men should do to you, do ye even so to them: for this is the law and the prophets."
Jesus also said "By this shall all men know that ye are my disciples, if ye have love one to another." (John 13:35). He eleaborates on it in the Gospel of Luke.
Luke 6
30Give to every man that asketh of thee; and of him that taketh away thy goods ask them not again.
31And as ye would that men should do to you, do ye also to them likewise.
32For if ye love them which love you, what thank have ye? for sinners also love those that love them.
33And if ye do good to them which do good to you, what thank have ye? for sinners also do even the same.
34And if ye lend to them of whom ye hope to receive, what thank have ye? for sinners also lend to sinners, to receive as much again.
35But love ye your enemies, and do good, and lend, hoping for nothing again; and your reward shall be great, and ye shall be the children of the Highest: for he is kind unto the unthankful and to the evil.
36Be ye therefore merciful, as your Father also is merciful.
All Christian ethics and morals boil down to two things- Love God, and love others.
Matthew 22:37 Jesus said unto him, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind.
38This is the first and great commandment.
39And the second is like unto it, Thou shalt love thy neighbour as thyself.
40On these two commandments hang all the law and the prophets.