Good morning, Dr. Chandra. This is Hal. I am ready for my first lesson. - Arthur C. Clarke

So this, thought Jan, with a resignation that lay beyond all sadness, was the end of man. It was an end that no prophet had foreseen – an end that repudiated optimism and pessimism alike.

Yet it was fitting: it had the sublime inevitability of a great work of art. Jan had glimpsed the universe in all its immensity, and knew now that it was no place for man. He realized at last how vain, in the ultimate analysis, had been the dream that lured him to the stars.

For the road to the stars was a road that forked in two directions, and neither led to a goal that took any account of human hopes or fears.

Perhaps it is better to be un-sane and happy, than sane and un-happy. But it is the best of all to be sane and happy. Whether our descendants can achieve that goal will be the greatest challenge of the future. Indeed, it may well decide whether we have any future.

Here the trees surrounded them with an invisible, anechoic blanket, so that every word seemed sucked into silence the moment it was uttered.