This degree actually has the candidate ritually removing Jesus Christ from the foundation of the Temple….The ceremony enacted out centres around a hidden vault that is found during rebuilding of Solomon’s Temple. The candidate is lowered down into this vault and told to remove the Cornerstone to allow more light into the vault. A Mason acting as Zerubbabel calls out to the candidate ‘Rise, wrench forth the keystone, and prepare to receive the light of the Holy Word’…The lecture includes the explanation “the secrets of the Royal Arch were only regained by wrenching forth the keystone thereof”

– The ‘Cornerstone’ Rejected, Christian-restoration.com

Cornerstone Quotables, Part II.