The words "flesh" and "body" mean basically the same thing and are repeated to emphasize how horrible death is. (See: [[rc://en/ta/man/translate/figs-doublet]])
AT: "physically wear down" or "become weak and unhealthy"
## You will say ##
AT: "You will think" (See: [[rc://en/ta/man/translate/figs-idiom]])
## I hated discipline ... my heart despised correction ##
These two phrases repeat the same idea and are repeated to emphasize how much this person disliked what the teacher had said. (See: [[rc://en/ta/man/translate/figs-parallelism]])