NET
18 For the message about the cross is foolishness to those who are perishing, but to us who are being saved it is the power of God.
Darby
18 For the word of the cross is to them that perish foolishness, but to us that are saved it is God's power.
KJV
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.