'Twould be a fool's pastime to measure swords when neither of us is certain that to-morrow will see our heads safe upon our shoulders.

I am not giving you a challenge.

I am simply warning you." "Warning?
You are kind.

However, one would think that you are afraid to die." "I am.

There is always something which makes life worth the living.
But it is not the fear of dying by the sword.