“This covenant [with Abraham], initiated, established, defined in promises and commands, and even guaranteed to be everlasting, by the sole sovereignty of the Lord God Almighty, is nevertheless a union of God with his people. It is the same union that comes to expression in the New Testament phrase ‘in Christ.’ This is the essence of the covenant concept, the essence of all true religion. The covenant God made with the man from Ur is the union God has established with his own in Christ Jesus, himself the epitome of covenant as the incarnate God-and-man, Immanuel. There is no more glorious concept given to men than this: God with us!” (John J. Mitchell, “Abram’s Understanding of the Lord’s Covenant,” The Westminster Theological Journal, XXXII, No. 1, November 1969, p. 48).
“The ‘walking before Jehovah’ pictures the constant presence of Jehovah to his [Abram’s] mind as walking behind him, and supervising him. The thought of the divine approval furnishes the motive for obedience. Also the force of El-Shaddai must be noticed. What shapes his conduct is not the general thought of God as moral ruler, but specifically the thought of El-Shaddai, who fills his life with miraculous grace.” (Geerhardus Vos, Biblical Theology, pp. 102–103).
Quotes from the Reflection for Trinity Presbyterian Church of the Orthodox Presbyterian Church.