Preaching ought to be the natural response to our relationship with Christ. Like the shepherds after hearing from the angels and seeing Jesus the Messiah.
Luke 2:20 “And the shepherds returned, glorifying and praising God for all they had heard and seen, as it had been told them.”
An unnamed leper plead with Jesus to heal him. Jesus responded with the unthinkable and touched him. With Jesus’ touch the man was healed. Jesus then told him not to tell anyone and this was the man’s response.
Mark 1:45 “But he went out and began to talk (preach) freely about it, and to spread the news, so that Jesus could no longer openly enter a town, but was out in desolate places, and people were coming to him from every quarter.”