15 He said to them, “But who do you say that I am?” 16 Simon Peter replied, “You are the Christ, the Son of the living God.” 17 And Jesus answered him, “Blessed are you, Simon Bar-Jonah! For flesh and blood has not revealed this to you, but my Father who is in heaven. – Matthew 16:15-17
Let us admire the noble confession which the apostle Peter makes in this passage. He says, in reply to our Lord’s question, “Who do you say that I am?”–”You are the Christ, the Son of the living God.”
At first sight a careless reader may see nothing very remarkable in these words of the apostle. He may think it extraordinary that they should call forth such strong commendation from our Lord. But such thoughts arise from ignorance and inconsideration. Men forget that it is a widely different thing to believe in Christ’s divine mission, when we dwell in the midst of professing Christians, and to believe in it when we dwell in the midst of hardened and unbelieving Jews. The glory of Peter’s confession lies in this, that he made it when few were with Christ and many against Him. He made it when the rulers of his own nation, the Scribes, and Priests, and Pharisees, were all opposed to his Master. He made it when our Lord was in the “form of a servant,” without wealth, without royal dignity, without any visible marks of a King. To make such a confession at such a time, required great faith and great decision of character. The confession itself, as Brentius says, “was an epitome of all Christianity, and a compendium of true doctrine about religion.” Therefore it was that our Lord said, “Blessed are you, Simon son of Jonah.”
~J.C. Ryle~
Expository Thoughts on the Gospels – Matthew (Edinburgh, Scotland; Banner of Truth; 1992) Commenting on Matthew 16:13-20.
(Wheaton, IL; Crossway Books; 2003) 
Wolfgang Musculus: What is a Covenant?
8 OctA covenant not only is based on friendship and mutual benevolence but also carries an obligation by which covenanting parties are mutually bound to one another. In the world, covenants are constituted for this purpose, so that each party gets something useful from it, whether peace or mutual aid. But that logic falls short here. Indeed, God does not make covenants with humans for that reason, that he might make use of their works or obtain some other advantage from their obligation to the covenant, but rather so that he might assure human beings of his will, faithfulness and beneficence by means of such a bond. The point is driven home [in Gen. 6:18] not only by calling this a covenant but also by the verb haqimoti that is, “I will establish, I will build, I will confirm.” Thus he labors on behalf of the weakness of our faith, lest we have any doubts about the firmness of his benevolence. Here, in the making of a covenant, God’s benevolence comes together with his faithfulness and truth–traits in which he has never failed anyone. He could have simply blessed Noah and his family, but God wished to strengthen him in his faith and confidence in him through the firmness of his own benevolence and truth.
~Wolfgang Musculus~
Reformation Commentary on Scripture: Genesis 1-11: (Downers Grove, IL; IVP Academic; 2012) p. 251-252.
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