“I desire the things which will destroy me in the end.”

“I get it. The things you hope for the most are the things that destroy you in the end.”

“The utilitarian doctrine is, that happiness is desirable, and the only thing desirable, as an end; all other things being only desirable as means to that end.”

“If, then, in the sphere of action there is some one end which we desire for its own sake, and for the sake of which we desire every thing else; and if we do not choose every thing for the sake of something else, for this would go on without limit, and our desire would be idle and futile, it is clear that this must be the supreme good, and the best thing of all.”

“If when matter is destroyed other matter takes its place, the new matter must come either from something that is or from something that is not. If from that-which-is, as long as that-which-is always remains, matter always remains. But if that-which-is is destroyed, such a theory means that not the world only but everything in the universe is destroyed.
If again matter comes from that-which-is-not: in the first place, it is impossible for anything to come from that which is not; but suppose it to happen, and that matter did arise from that which is not; then, as long as there are things which are not, matter will exist. For I presume there can never be an end of things which are not.”

“The soul, when accustomed to superfluous things, acquires a strong habit of desiring things which are neither necessary for the preservation of the individual nor for that of the species. This desire is without limit, whilst those which are necessary are few in number and restricted within certain limits; but what is superfluous is without end…”

“The world was to me a secret which I desired to devine.”

“Then I can see that I'm with you [in Dresden] at the end of April - beginning of May. Then I'll also paint with you the few works which are desired of me, if you'll help me - because I have already forgotten how to paint.”

“They will love me for that which destroys me.”

“And yet these things for which we should strive eagerly, things so closely akin to ourselves, so truly our own, we treat with great slackness and constant indifference and thus destroy the germs of excellence, while those things in which deficiency were a merit we desire with an insatiable yearning.”