One teaching of Jesus Christ is the command to "Judge not, that ye be not judged." (Matthew 7:1, King James Version). Here, Jesus is saying that He is the final judge of all human beings. The implication for us is that we should not spend time judging others, we have our own problems, sins, and weaknesses to work out and we're no better than others.
Another teaching of Jesus Christ is His call for us to "Repent: for the kingdom of heaven is at hand." (Matthew 4: 17, King James Version). The implication is that only by way of true repentance can we be reconciled to God. In addition, our repentance causes us to change our way of thinking and living. We strive to overcome sin and live by the laws of God, which in turn is beneficial to us and our fellow man.
A third teaching of Jesus Christ is "But if ye do not forgive, neither will your Father which is in heaven forgive your trespasses." (Mark 11:26, King James Version). The ethical implication here is that we cannot demand forgiveness from God for our sins and wrongdoings if we refuse to extend forgiveness to others. Jesus Christ is showing the extreme importance of mercy and forgiveness towards others.
A fourth teaching of Jesus Christ is to "Render therefore unto Caesar the things which be Caesar's, and unto God the things which be God's." (Luke 20: 25, King James Version). Here, Jesus is telling us that it is right to obey the governments who have authority over us. In essence, he's talking about paying taxes, giving to the authorities what they have the legal right to claim from the citizenry. The implication is that we must obey the laws of the nation in which we live.
A fifth teaching of Jesus Christ is " A new commandment I give unto you, That ye love one another; as I have loved you, that ye also love one another." (John 13:34, King James Version). The implication here is that love solves a multitude of problems. When we obey Jesus Christ's command to love others we will think and act in their best interests, desiring no harm or misfortune to come upon them. This is the essence of ethical behavior.