“We might summarize our present human situation by the simple statement: that in the 20th century, the glory of the human has become the desolation of the Earth and now the desolation of the Earth is becoming the destiny of the human.From here on, the primary judgment of all human institutions, professions, programs and activities will be determined by the extent to which they inhibit, ignore, or foster a mutually-enhancing human/Earth relationship.”

“The destiny of humans cannot be separated from the destiny of earth.”

“The greatest of all the accomplishments of 20th century science has been the discovery of human ignorance”

“We are the intelligent elite among animal life on earth and whatever our mistakes, [Earth] needs us. This may seem an odd statement after all that I have said about the way 20th century humans became almost a planetary disease organism. But it has taken [Earth] 2.5 billion years to evolve an animal that can think and communicate its thoughts. If we become extinct she has little chance of evolving another.”

“The only true and effective "operator's manual for spaceship earth" is not a book that any human will ever write; it is hundreds of thousands of local cultures.”

“To have humanism we must first be convinced of our humanity. As we move further into decadence this becomes more difficult.”

“For human beings, the most daunting challenge is to become fully human. For to become fully human is to become fully divine.”