Preach My Gospel, pg. 6; “The Message of the Restoration: The Foundation of Faith – No matter where you serve or whom you teach, center your teaching on the Restoration of the gospel of Jesus Christ…As you study the doctrines in the missionary lessons, you will come to see that we have one message: Through a modern prophet, God has restored knowledge about the plan of salvation, which is centered on Christ’s Atonement and fulfilled by living the first principles and ordinances of the gospel.”
1 Peter 2:6-7; “Wherefore also it is contained in the scripture, Behold, I lay in Sion a chief corner stone, elect, precious: and he that believeth on him shall not be confounded. 7 Unto you therefore which believe he is precious: but unto them which be disobedient, the stone which the builders disallowed, the same is made the head of the corner.”
When you’re out preaching the gospel why wouldn’t the central theme be the gospel?