<p>6:17 <i>Therefore God, determined to show more abundantly to the heirs of the promise the immutability of His purpose, confirmed with an oath</i>- The word of promise was enough, seeing it came from God; but God confirmed it with an oath, because He was &quot;determined&quot; to show us the certainty of the promise. Despite having promised us eternal inheritance, as promised to Abraham, God is eager for us to accept it. He has not just made promises and left us to do our part by believing them. He comes to meet us, using every logical, intellectual and spiritual instrument to do so, and crowning them all with the death of His Son to confirm the word of promise to Abraham which comprised the new covenant. God discerned that we fear His promise might change; the oath showed it was immutable. Perhaps our wide experience of failed promises and agreements is the psychological root of our difficulty in accepting the most simple truth- that we really shall be saved if we have said 'Yes' to God's purpose of salvation for us. The Galatians like the Hebrews had been &quot;removed&quot; from the Christian Gospel to another (Gal. 1:6); and &quot;immutable&quot; here translates the negative of this word, the 'not-removable' nature of God's promise. The priesthood was &quot;changed&quot; (7:12), but the new covenant promises of God to Abraham of our salvation will not be &quot;changed&quot; as they are not-changeable, &quot;immutable&quot;.</p>