Daniel Weaver

“To be a warrior a man has to be, first of all, and rightfully so, keenly aware of his own death. But to be concerned with death would force any one of us to focus on the self and that would be debilitating. So the next thing one needs to be a warrior is detachment. The idea of imminent death, instead of becoming an obsession, becomes an indifference.
Now you must detach yourself; detach yourself from everything. Only the idea of death makes a man sufficiently detached so he is incapable of abandoning himself to anything. Only the idea of death makes a man sufficiently detached so he can't deny himself anything. A man of that sort, however, does not crave, for he has acquired a silent lust for life and for all things of life. He knows his death is stalking him and won't give him time to cling to anything, so he tries, without craving, all of everything.”
― Carlos Castaneda, A Separate Reality: Further Conversations with Don Juan