1. But if our descendants(后代)know the answers to the questions which perplex(困扰) us today, there will still be one field of which they do not know, namely the future.
2. We remember a beauty that faded, a love that waned(消逝). But we remember with far greater pain that we did not see that beauty when it flowered, that we failed to respond with love when it was tendered.
3. Ultimately, we must confront the inevitability of our own demise, losing ourselves as it were, all that we were or dreamed to be.
4. In order to resolve this paradox, we must seek a wider perspective(视角),viewing our lives as through windows that open on eternally(永恒).
5. Put them all together, exalt(使超越)them above their imperfections, add to them the vision of humankind free of need and strife(战争)and you have a future lighted with the radiant colors of hope.
6.But there is every reason to think that as we learn more about the physiology of the brain, we shall do so, and that the great philosophical problems about knowledge and will are going to be pretty fully cleared up.
7. And where science gives us a hope of knowledge it is often reasonable to suspend(暂停)judgment.
8. Some people say we have only got to do the duties revealed in the past, and laid down by religion, and God will look after the future.
9. Whether we adopt Marxism or any other philosophy, we cannot understand it without knowing something of how it developed.