Preaching the Gospel
Preaching the gospel is nothing more than introducing Jesus to people.
God will do all the work from there on.
I have planted, Apollos watered; but God gave the increase. So then neither is he that planteth any thing, neither he that watereth; but God that giveth the increase. Now he that planteth and he that watereth are one: and every man shall receive his own reward according to his own labour. For we are labourers together with God: ye are God's husbandry, ye are God's building.
- 1 Corinthians 3:6-9 (KJV)
Walk in love.