Here is a special Chi-Rho inscription found near the tomb of St. Peter:
In 1 Corinthians 1:18-19 Paul writes. "The message of the cross is complete absurdity to those who are headed for ruin, but to us who are experiencing salvation it is the power of God."
The cross is a stumbling block to many. 1 Corinthians 1:23 "But we preach Christ crucified-a stumbling block to Jews and an absurdity to Gentiles."
Paul goes onto say in 1 Corinthians 2:2 "I determined that while I was with you I would speak of nothing but Jesus Christ and him crucified."