15 And the angel of the Lord called unto Abraham out of heaven the second time, 16 And said, By myself have I sworn, saith the Lord, for because thou hast done this thing, and hast not withheld thy son, thine only son: 17 That in blessing I will bless thee, and in multiplying I will multiply thy seed as the stars of the heaven, and as the sand which is upon the sea shore; and thy seed shall possess the gate of his enemies; 18 And in thy seed shall all the nations of the earth be blessed; because thou hast obeyed my voice.
One thing that stood out to me in this study was how many times God reaffirmed His promises to Abraham. This reaffirmation, though, coming after Abraham has passed the ultimate test of his obedience, is the last time. Before this moment every affirmation was only an offer from God, contingent upon Abraham’s continued faithfulness. Here, at last, the promise is made sure. There will be no more proving.
This is the goal that Peter speaks of in 2 Peter 1:10, where our calling and election are made sure. It is a long and difficult road to attain that surety, though. It is not a cheap gift, and so it cannot be earned cheaply. It is something to give one’s whole life in pursuit of.