No hangup on nature is going to solve anything -- nature is bestial -- desire for Eternal Life of the individual is bestial, is the final creature-longing -- I say, Let us cease bestiality & go into the bright room of the mind realizing emptiness, and sit with the truth. And let no man be guilty, after this, Dec. 9 1954, of causing birth. -- Let there be an end to birth, an end to life, and therefore an end to death. Let there be no more fairy tales and ghost stories around and about this. I don't advocate that everybody die, I only say everybody finish your lives in purity and solitude and gentleness and realization of the truth and be not the cause of any further birth and turning of the black wheel of death. Let then the animals take the hint, and then the insects, and all sentient beings in all one hundred directions of the One Hundred Thousand Chilicosms of Universes. Period.Nature is the cause of all our suffering; joy is the reverse side of suffering. Instead of seducing women, control yourself and treat them like sisters; instead of seducing men, control yourself and treat them like brothers. For life is pitiful.Stop.
Some of the Dharma, Viking 1997, p. 175, (bold added)