We must progress to the stage of doing all the right things for all the right reasons instead of doing all the right things for all the wrong reasons.

Whatever humans have learned had to be learned as a consequence only of trial and error experience. Humans have learned only through mistakes.

Whether we are able to be a complete success or failure is in such critical balance that every smallest human test of integrity every smallest moment-to-moment decision tips the scales affirmatively or negatively.

In the United States, throughout all twenty-four hours of every day of the year - year after year - we have an average of two million automobiles standing in front of red lights with their engines going, the energy for which amounts to that generated by the full of efforts of 200 million horses being completley wasted as they jump up and down going nowhere.

I look for what needs to be done

Those who play with the devil's toys will be brought by degrees to wield his sword.

Our little Spaceship Earth is only eight thousand miles in diameter, which is almost a negligible dimension in the great vastness of space.... Spaceship Earth was so extraordinarily well invented and designed that to our knowledge humans have been on board it for two million years not even knowing that they were on board a ship.