Friedrich Nietzsche, in his book “Untimely Meditations”:
“Try for once to justify the meaning of your existence as it were a posteriori by setting yourself an aim, a goal…an exalted and noble ‘to this end.’ Perish in pursuit of this and only this”
As quoted to me by a domain squatter, spamming me about the upcoming availability of the not-at-all-sought-after “p-bone.com”.
“Justify the meaning of your existence” indeed.