‘man’ in this case is gender neutral…
And ‘detachment’ here is letting go of the self – one’s ego and self-absorption…
“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.
A detached man, who knows he has no possibility of fencing off his death, has only one thing to back himself with: the power of his decisions. He has to be, so to speak, the master of his choices. He must fully understand that his choice is his responsibility and once he makes it there is no longer time for regrets or recriminations. His decisions are final, simply because his death does not permit him time to cling to anything.”