Tom Oates is rector of Christ Church of Hamilton and Wenham, Massachusetts. His idea of an evangelism tract would be a a card on which was written three statements:
He said that most unbelievers will agree with the first two statements, but usually not with the third. So the unbeliever would be on his way to recognizing his need for a Savior when the Spirit convicts him of sin such that he finally agrees with the third statement.
I would then add these three statements in the back of the card. These explain how the impossibilities in the front of the card are fulfilled only by the Savior, before whom the sinner repents, and in whom he believes.