Jeremiah is called the weeping prophet for the attitude he manifested toward the people of God in Judah. He would warn them of their departures from God and the coming destruction of Jerusalem by Nebuchadnezzar. He mourned for them because they would not turn from their sins. The idea of mourning or crying may cover any number of different human emotions. However the context here is of the individual who mourns because of his sins. A person coming to realize they are in sin, should seek the way out of such condition.
The person under consideration wants to change the direction of their life. Though not stated it is more than just “feeling sorry” for sin. True sorrow for sin brings about repentance (2 Cor. 7:10). Repentance is a change of mind that leads to a change in action. A person is living a different kind of life. Jesus instructs here that a person who is sorry for the sin in their life will move to do whatever it takes to get rid of the sin. Repentance always calls for action. In Acts 2 the audience touched by their sins were told to be baptized as a result of repentance. They wanted to change.
Upon their obedience on that day their sins were remitted or forgiven. Peter and John used the same lesson to another audience and that audience was told they would receive “seasons of refreshing” from the Lord (Acts 3:19). Jesus promised the apostles that He would not leave them as orphans in the world (John 14:18). He would send to them the Comforter, which is the Spirit of truth (verses 16,17). The person who obeys the gospel of Jesus Christ is comforted in knowing his sins have been removed.