John Gill Commentary Mark 8:37

"For what should a man give in exchange for his life?" — Mark 8:37 (ASV)

Or what shall a man give in exchange for his soul ?

] To deliver it out of its miserable state and condition; all the riches of the world, and the whole world itself, are not an equivalent to it, or a sufficient ransom for it; riches will not profit in the day of wrath, or deliver a soul from damnation, and ruin: therefore, if he had the whole world, he could not redeem his soul with it; and he has nothing else to give for it, and therefore it is past all recovery: (See Gill on Matthew 16:26).