Preach the Gospel to yourself

Preach the Gospel to yourself everyday, because you need to. How can you preach the Gospel to others if you don't believe it yourself?

“Relying on God has to begin all over again every day as if nothing had yet been done.” - C.S. Lewis

1 Corinthians 9:27
No, I strike a blow to my body and make it my slave so that after I have preached to others, I myself will not be disqualified for the prize.