Wherefore He is able also to save them to the uttermost… -Hebrews 7:25

“He is able to save to the uttermost.” Now, I will certainly affirm, and no one can deny it, that no one here knows how far the uttermost is. David said, if he took the wings of the morning, to fly to the uttermost parts of the sea, even there should God reach him. But who knoweth where the uttermost is? Borrow the angel’s wing, and fly far, far beyond the most remote star: go where wing has never flapped before, and where the undisturbed ether is as serene and quiet as the breast of Deity itself; you still, beyond the bounds of creation, where space itself falls, and where chaos takes up its reign, will not come to the uttermost. It is too far for mortal intellect to conceive of; it is beyond the range of reason or of thought. Now, our text tells us that Christ is “able to save to the uttermost.”

Sinner, Christ is “able to save to the uttermost;” by which we understand that the uttermost extent of guilt is not beyond the power of the Saviour. Can any one tell what is the uttermost amount to which a man might sin?..oh! ye chief of sinners! Christ is “able to save to the uttermost.” Tell that everywhere, in every garret, in every cellar, in every haunt of vice, in every kennel of sin; tell it everywhere! “To the uttermost!” “He is able to save them to the uttermost.” ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0084.cfm