Most of us want to impress other people in some way. None of us are totally immune from this as human beings. Jesus says we need to be careful in this area. He says when we do deeds to impress others rather than out of devotion and love for God, well, God is not impressed!
A big key that helps understand the Sermon on the Mount is to pay attention to Jesus saying, “For I tell you that unless your righteousness surpasses that of the Pharisees and the teachers of the law, you will certainly not enter the kingdom of heaven. In this post Greg Taylor points to six ways Jesus declares that we are to "surpass the form of righteousness" practiced by religious people.
Over the years The Journey preacher Greg Taylor has studied, prayed through, memorized portions of the Sermon on the Mount, but more than anything else, he has started to think and pray about how to live it as a “field manual for Doing what Jesus Says in the Sermon on the Mount."