When you have seen one ant, one bird, one tree, you have not seen them all.

Old beliefs die hard even when demonstrably false.

If those committed to the quest fail, they will be forgiven. When lost, they will find another way. The moral imperative of humanism is the endeavor alone, whether successful or not, provided the effort is honorable and failure memorable.

There is no better high than discovery.

Sometimes a concept is baffling not because it is profound but because it is wrong.

To the extent that philosophical positions both confuse us and close doors to further inquiry, they are likely to be wrong.

Even as empiricism is winning the mind, transcendentalism continues to win the heart.

Theology made no provision for evolution. The biblical authors had missed the most important revelation of all! Could it be that they were not really privy to the thoughts of God?

Political ideology can corrupt the mind, and science.

If history and science have taught us anything, it is that passion and desire are not the same as truth.

Nature holds the key to our aesthetic, intellectual, cognitive and even spiritual satisfaction.

Blind faith, no matter how passionately expressed, will not suffice. Science for its part will test relentlessly every assumption about the human condition.

The one process now going on that will take millions of years to correct is the loss of genetic and species diversity by the destruction of natural habitats. This is the folly our descendants are least likely to forgive us.

Without a trace of irony I can say I have been blessed with brilliant enemies. I owe them a great debt, because they redoubled my energies and drove me in new directions.

The essence of humanity’s spiritual dilemma is that we evolved genetically to accept one truth and discovered another. Is there a way to erase the dilemma, to resolve the contradictions between the transcendentalist and the empiricist world views?

If all mankind were to disappear, the world would regenerate back to the rich state of equilibrium that existed ten thousand years ago. If insects were to vanish, the environment would collapse into chaos.

The historical circumstance of interest is that the tropical rain forests have persisted over broad parts of the continents since their origins as stronghold of the flowering plants 150 million years ago.

People need a sacred narrative. They must have a sense of larger purpose, in one form or another, however intellectualized. They will find a way to keep ancestral spirits alive.

We should preserve every scrap of biodiversity as priceless while we learn to use it and come to understand what it means to humanity.

Every major religion today is a winner in the Darwinian struggle waged among cultures, and none ever flourished by tolerating its rivals.

A very Faustian choice is upon us: whether to accept our corrosive and risky behavior as the unavoidable price of population and economic growth, or to take stock of ourselves and search for a new environmental ethic.

It’s obvious that the key problem facing humanity in the coming century is how to bring a better quality of life – for 8 billion or more people – without wrecking the environment entirely in the attempt.

You are capable of more than you know. Choose a goal that seems right for you and strive to be the best, however hard the path. Aim high. Behave honorably. Prepare to be alone at times, and to endure failure. Persist! The world needs all you can give.

True character arises from a deeper well than religion.

Destroying rainforest for economic gain is like burning a Renaissance painting to cook a meal.

It’s like having astronomy without knowing where the stars are.

When you have seen one ant, one bird, one tree, you have not seen them all.

We are drowning in information, while starving for wisdom. The world henceforth will be run by synthesizers, people able to put together the right information at the right time, think critically about it, and make important choices wisely.

The human mind evolved to believe in the gods. It did not evolve to believe in biology.

By any reasonable measure of achievement, the faith of the Enlightenment thinkers in science was justified.

Perhaps the time has come to cease calling it the “environmentalist” view, as though it were a lobbying effort outside the mainstream of human activity, and to start calling it the real-world view.