The Purpose of Abraham’s Separation

In answering this question one is automatically giving his view on what the Church is, its relation to the world and to heaven, as well as defining the conception of the Covenant and its development in history. And that, it seems to me, is quite a series of important subjects. So please do not expect that I intend at arriving at any one conclusion and say, "now then, that is the purpose of his separation". When the question is asked why God called Abraham apart and what may be God's purpose in...