Timothy - 1 John 2:2

He is the atoning sacrifice for our sins, and not only for ours but also for the sins of the whole world. (1 John 2:2 NIV)

The key to the missionary message is Jesus' sacrifice.  The great limitless significance of this sacrifice  is that it is for EVERYONE!!!

If we preach not the gospel (Jesus takes away our sins) - God forbid.   Sure he healed me, saved me and blesses but the gospel is JESUS died for our sins.