For the sake of His body, which is the church

Colossians 1:24
I now rejoice in my sufferings for you, and fill up in my flesh what is lacking in the afflictions of Christ, for the sake of His body, which is the church,

Paul the preacher, teacher, evangelist, apostle empties himself and preached wholeheartedly for Christ. He would point to the person of Yehsua Ha Masiach. This is the same way we should reveal the gospel to others as it is. It is not about telling others of just a transformed life or the benefits or blessings. The core message of the gospel in the person of Yeshua needs to be conveyed. Ultimately it is God who would bring this message to bloom within the hearer and establish the Kingdom in their hearts.