This week we begin worship with:
So when God desired to show more convincingly to the heirs of the promise the unchangeable character of his purpose, he guaranteed it with an oath, so that by two unchangeable things, in which it is impossible for God to lie, we who have fled for refuge might have strong encouragement to hold fast to the hope set before us.
His oath was "Surely I will bless you and multiply you." (Hebrews 6:14).
Genesis 22:16-17
“By myself I have sworn, declares the Lord, because you have done this and have not withheld your son, your only son, I will surely bless you, and I will surely multiply your offspring as the stars of heaven and as the sand that is on the seashore.”
While a promise was sufficient, God sealed it with a vow. Why? For us, our encouragement. Nothing more.
We rest in the "unchangeable".
Every good gift and every perfect gift is from above, coming down from the Father of lights, with whom there is no variation or shadow due to change.