The Sermon on the Mount (Matthew 5-7) pretty much summarizes the teaching of Jesus.
It begins with 3 striking thoughts:
Blessed are the poor in spirit, for theirs is the kingdom of heaven.
Blessed are those who mourn, for they shall be comforted.
Blessed are the meek, for they shall inherit the earth.
Here is one of the constant warnings the Apostle Paul always seemed to hammer home to the early churches: “Do not think you are better than you really are. Be honest in your evaluation of yourself. Let God change you inwardly, by showing you who you really are.” Romans 12:2