In her book It Only Hurts When I Laugh, Ethel Barrett tells about a king of Sparta in ancient Greece who boasted to a visiting monarch about the mighty walls of Sparta. But the guest didn't see any walls, and finally he said to his host, "I'd like to see those walls. Show them to me!" The Spartan ruler pointed with great satisfaction to some disciplined and well-trained troops, part of Sparta's mighty army, and exclaimed, "There they are! Those are the walls of Sparta!"
Just as each Spartan soldier was viewed as a brick in a mighty way, so we are to think of Christians as "living stones…built up a spiritual house" (1 Pet. 2:5). And because it is built by Christ Himself, it can never be destroyed.