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:

 As it stands this doctrine is stated in categories which are outworn. It speaks of the descent into Hades and the very word descent suggests a three-storey universe in which heaven is localized above the sky and Hades beneath the earth. But, laying aside the physical categories of this doctrine, we can find in it truths which are eternally valid and precious, three in particular. 