Two would leave Calvary that day headed for Heaven, while one would die with his pride intact and his soul separated from God for eternity. It was the difference in Jesus that people sought. Jesus did not play down to the level of the leadership, placing the law above the needs of others. It is good for nothing anymore, except to be thrown out and trampled under foot by men. These verses may appear to be at odds with each other.
Salt is only affective to prevent rotting if it is applied to that which it is to preserve.
We are not to touch, to work with or accept, the unclean things in this world. The Holy Spirit will convict a believer of what is unclean in or near his or her life. But in order to preserve meat, salt must be rubbed into the meat. We must be willing to get directly involved with people, not condemning or tearing them down. Letting them know that Jesus stands ready to forgive them, and show them His compassion when the opportunity is given.