The greatest stumbling block to men entering eternal life is the simplicity of salvation.  Men want to "do" something to earn salvation, but God says it is a gift, because Jesus Christ paid the price on the cross.  He bought eternal life for every man. However, the gift must be received by faith.  The Philippian jailer asked Paul and Silas, "Sirs, what must I do to be saved?" To which they answered, "Believe in the Lord Jesus Christ, and you shall be saved ... " (ACT 16:30-31) more...