Christians are made, not born. - Tertullian

For whence is it that the bishops and clergy come? Is it not from all? If all are not bound to monogamy, whence are monogamists (to be taken) into the clerical rank? Will some separate order of monogamists have to be instituted, from which to make selection for the clerical body? (No); but when we are extolling and inflating ourselves in opposition to the clergy, then “we are all one:” then “we are all priests, because He hath made us priests to (His) God and Father.”

But the Christian verity has distinctly declared this principle, “God is not, if He is not one;” because we more properly believe that that has no existence which is not as it ought to be.

The argument for Christian practices becomes all the stronger, when also nature, which is the first rule of all, supports them. Well, she is the first who lays it down that a crown does not become the head.