Thomas Boston: Christ the mediator in the Old Testament

I will post something soon from Thomas Boston's notes on The Marrow of Modern Divinity, particularly his understanding of the relationship between the covenant of works and the covenant of grace at Sinai. His comment below touches on it, but shouldn't be taken as indicating all that he has to say. He also says "But that the covenant of works was also, for special ends, repeated and delivered to the Israelites on Mount Sinai, I cannot refuse."

What struck me was his clear understanding that it was the Son of God who was dealing with Israel at Sinai. On of his proof texts for establishing that the Son has the same sovereign authority as the Father is Exodus 23:21.

The paucity of recognition, let alone emphasis of this fact, in the contemporary church, is lamentable:

The preface to the ten commandments deserves a particular notice in the matter of the Sinai transaction, Exod. 20:2, "I am the Lord thy God, which have brought thee out of the land of Egypt, out of the house of bondage."

Hence it is evident to me, that the covenant of grace was delivered to the Israelites on Mount Sinai. For the Son of God, the messenger of the covenant of grace, spoke these words to a select people, the natural seed of Abraham, typical of his whole spiritual seed.