“Yet it is unassailably true that so long as we lack omniscience and do not know all of the future, all our generalizations are fallible or only probable. And the history of human error shows that a general consensus, or widespread and unquestioned feeling of certainty, does not preclude the possibility that the future may show us to be in error.”

“The laws of history are as absolute as the laws of physics, and if the probabilities of error are greater, it is only because history does not deal with as many humans as physics does atoms, so that individual variations count for more.”

“The fact that the biosphere responds unpredictably to our actions is not an argument for inaction. It is, however, a powerful argument for caution, and for adopting a tentative attitude toward all we believe, and all we do. Unfortunately, our species has demonstrated a striking lack of caution in the past. It is hard to imagine that we will behave differently in the future.We think we know what we are doing. We have always thought so. We never seem to acknowledge that we have been wrong in the past, and so might be wrong in the future. Instead, each generation writes off earlier errors as the result of bad thinking by less able minds--and then confidently embarks on fresh errors of its own.We are one of only three species on our planet that can claim to be self-aware, yet self-delusion may be a more significant characteristic of our kind.”

“...we are all wont to make mistakes, but if we learn from each trick, each error, and refuse to allow it to happen again, then the experience is not a loss, but a lifelong gain. Our pride may sting for the moment, but our future will be the better for it.”

“The longer I do my job ... the more I realize that humans lack good mirrors. It's so hard for anyone to show us how we look, and so hard for us to show anyone how we feel.”

“Generally speaking, the errors in religion are dangerous; those in philosophy only ridiculous.”