Confidence?

"And death shall be no more; death, thou shalt die."
("Death, be not proud" - John Donne)

The theme of this poem is:  Death, I am not scared of you.  Or am I?

In the quote above, there is a paradox which I really had to think about.  In the poem, death is compared to sleep.  Since sleep is a leisurely activity, death should also be pleasurable.  Pretty logical reasoning I'd say.  With this eternal sleep comes eternal life.  Therefore, death kills earthly life, but in the process, death is killed by eternal life.  Okay, maybe that does not make any sense, but trust me, it makes sense in my mind.  Maybe.

The speaker is so insulting towards death, almost like an immature fourth grader.  I thought calling death a "slave to fate" was pretty low.  I mean, I don't think death is that bad; in fact, it allows us to enter God's kingdom.  So, why does the speaker keep insulting death over and over again?  Personally, I believe the speaker is trying to give himself a pep talk.  He is probably terrified out of his mind because everything that occurs after death is so unknown.  The unknown is always something that scares every person (especially that axe murderer living in the cheer closet the other day).  The speaker is not confident;  in fact, he is acting quite desperate.  He even contradicts himself in his argument.  Sometimes, we just need to let the impossible go.