“To live sustainably, we must live efficiently - not misdirecting or squandering the earth's precious resources. To live efficiently, we must live peacefully for military expenditures represent an enormous diversion of resources from meeting basic human needs. To live peacefully, we must live with a reasonable degree of equity, or fairness, for it is unrealistic to think that, in a communications-rich world, a billion people will except living in absolute poverty while another billion live in conspicuous excess.”

“Poverty is the absence of all human rights. The frustrations, hostility and anger generated by abject poverty cannot sustain peace in any society. For building stable peace we must find ways to provide opportunities for people to live decent lives.”

“If there is a God and future life, there is truth and good, and man's highest happiness consists in striving to attain them. We must live, we must love, and we must believe that we live not only today on this scrap of earth, but have lived and shall live”

“The old myth of unlimited growth alienates human beings from nature. To live sustainably we must respect nature and live by its rules. We must walk softly, leaving as small a footprint as possible.”

“We can't leave people in abject poverty, so we need to raise the standard of living for 80% of the world's people, while bringing it down considerably for the 20% who are destroying our natural resources.”

“We must be careful with our lives, for Christ's sake, because it would seem that they are the only lives we are going to have in this puzzling and perilous world, and so they are very precious and what we do with them matters enormously.”