Don Giovanni, 'Seducer of Seville'

A warrior must focus his attention on the link between
himself and his death. Without remorse or sadness or worrying, he
must focus his attention on the fact that he does not have time and
let his acts flow accordingly. He must let each of his acts be his
last battle on earth. Only under those conditions will his acts
have their rightful power. Otherwise they will be, for as long as
he lives, the acts of a fool.~