Acts 1:8 But you will receive power when the Holy Spirit comes on you; and you will be my witnesses in Jerusalem, and in all Judea and Samaria, and to the ends of the earth.
Nonbelievers must hear the gospel an average of 7.6 times before they receive it. So if anyone walks away from you when you share the gospel with him, remember: the Word of God never returns void. Maybe the person you shared with has never heard it before. Maybe this is only the second time he has ever heard it, or maybe this is his 6.6th time. – Willaim Fay, Share Jesus Without Fear (Kindle Location 284-286).