Because it is contained in Scripture, "Behold, I lay in Zion a chief cornerstone, chosen, and precious: He who believes in him will not be disappointed."
[26] Dean Plumptre, as quoted by R. Tuck, The Pulpit Commentary, Vol. 15, 2(Grand Rapids, Michigan: Wm. B. Eerdmans Publishing Company, 1950), p. 356.