God also bound himself with an oath, so that those who received the promise could be perfectly sure that he would never change his mind. So God has given both his promise and his oath. These two things are unchangeable because it is impossible for God to lie. Therefore, we who have fled to him for refuge can have great confidence as we hold to the hope that lies before us.
God cannot lie, when he says something it will stand for all time. God isn’t about changing his mind, he’s never unsure. So our faith in God, who doesn’t lie, can be reassured. His promises are real and can be relied on.