We know that to wage a nuclear war today, for example, would be a form of suicide; or that to pollute the air or the oceans in order to achieve some short-term benefit would be to destroy the very basis for our survival.
The flip side of suicide is that it leaves a lingering question in the minds of the people who survived. Its like a cancer thats metastasized. The suicide is the cancer and the metastasis is all these people saying, Why? Why? Why?
If the book we are reading does not wake us, as with a fist hammering on our skull, why then do we read? So that it shall make us happy? Good God, we should also be happy if we had no books, and such books as make us happy we could, if need be, write ourselves. But what we must have are those books which come upon us like ill fortune, and distress us deeply, like the death of one we love better than ourselves; like suicide. A book must be an ice-axe to break the sea frozen inside us.