Old age is the supreme evil, for it deprives man of all pleasures while allowing his appetites to remain, and it brings with it every possible sorrow. Yet men fear death and desire old age.
Mankind is like dogs, not gods - as long as you don't get mad they'll bite you - but stay mad and you'll never be bitten. Dogs don't respect humility and sorrow.
If future generations are to remember us more with gratitude than sorrow, we must achieve more than just the miracles of technology. We must also leave them a glimpse of the world as it was created, not just as it looked when we got through with it.
The sorrow for the dead is the only sorrow from which we refuse to be divorced. Every other wound we seek to heal - every other affliction to forget: but this wound we consider it a duty to keep open - this affliction we cherish and brood over in solitude.