All our knowledge merely helps us to die a more painful death than animals that know nothing.

(there is) no other means of escaping from one's consciousness than to deny it, to look upon it as an organic disease of the terrestrial intelligence - a disease which we must endeavor to cure by an action which must appear to us an action of violent and willful madness, but which, on the other side of our appearances, is probably an action of health. ("Of Immortality")

When we lose someoe we love, our bitterest tears are called forth by the memory of hours when we loved not enough.

All our knowledge merely helps us to die a more painful death than the animals that know nothing

Of what avail are my loftiest thoughts if I have ceased to exist?” there are some will ask; to whom others, it may be, will answer, “What becomes of myself if all that I love in my heart and my spirit must die, that my life may be saved?” And are not almost all the morals, and heroism, and virtue of man summed up in that single choice?

To be happy is only to have freed one's soul from the unrest of unhappiness.