Whether the Old Law was given through the angels?

Objections

Objection 1 : It seems that the Old Law was not given through the angels, but immediately by God. For an angel means a "messenger"; so that the word "angel" denotes ministry, not lordship, according to Ps. 102:20,21: "Bless the Lord, all ye His Angels . . . you ministers of His." But the Old Law is related to have been given by the Lord: for it is written (Ex. 20:1): "And the Lord spoke . . . these words," and further on: "I am the Lord Thy God." Moreover the same expression is often repeated in Exodus, and the later books of the Law. Therefore the Law was given by God immediately.
Objection 2 : Further, according to Jn. 1:17, "the Law was given by Moses." But Moses received it from God immediately: for it is written (Ex. 33:11): "The Lord spoke to Moses face to face, as a man is wont to speak to his friend." Therefore the Old Law was given by God immediately.
Objection 3 : Further, it belongs to the sovereign alone to make a law, as stated above (Question [90], Article [3]). But God alone is Sovereign as regards the salvation of souls: while the angels are the "ministering spirits," as stated in Heb. 1:14. Therefore it was not meet for the Law to be given through the angels, since it is ordained to the salvation of souls.