1 Corinthians 1:18
For the preaching of the cross is to them that perish foolishness; but unto us which are saved it is the power of God.
The message of the cross is foolishness to those who are perishing. To those who are saved, the gospel is the power of God. They hear the message, they accept it by faith, and the miracle of regeneration takes place in their lives. The cross always leads to salvation, so if anyone desires to be regenerated, they must come through the cross.