The world moves into the future as a result of decisions, not as a result of plans. Plans are significant only insofar as they affect decisions.

Anyone who believes exponential growth can go on forever in a finite world is either a madman or an economist.

If we saw tomorrow's newspaper today, tomorrow would never happen.

Knowledge exists in minds, not in books. Before what has been found can be used by practitioners, someone must organize it, integrate it, extract the message.

If the society toward which we are developing is not to be a nightmare of exhaustion, we must use the interlude of the present era to develop a new technology which is based on a circular flow of materials such that the only sources of man's provisions will be his own waste products.

Don't go to great trouble to optimize something that never should be done at all. Aim to enhance total systems properties, such as creativity, stability, diversity, resilience, and sustainability - whether they are easily measured or not.

There is a quiet, open place in the depths of the mind, to which we can go many times in the day and lift up our soul in praise, thankfulness and conscious unity. With practise this God-ward turn of the mind becomes an almost constant direction, underlying all our other activities.