But sanctify the Lord God in your hearts; and always be ready to give an answer to everyone who asks you a reason concerning the hope that is in you, with humility and fear:

 It may be that we will never agree in our theories of what exactly happened on the Cross, for, indeed, as Charles Wesley said in that same hymn: "'Tis mystery all!" But on one thing we can agree--through what happened there we may enter into a new relationship with God. 