"One of the things that is wrong with religion is that it teaches us to be satisfied with answers which are not really answers at all."

"By all means let's be open-minded, but not so open-minded that our brains drop out."

"We humans are an extremely important manifestation of the replication bomb, because it is through us - through our brains, our symbolic culture and our technology - that the explosion may proceed to the next stage and reverberate through deep space."

"Of course in science there are things that are open to doubt and things need to be discussed. But among the things that science does know, evolution is about as certain as anything we know."

"Stand firm when justice demands it, even if you stand entirely alone. This remains the cornerstone of personal mastery."

"Justice is the means bywhich established injustices are sanctioned."

"It's a struggle for every young Black man. You know how it is, only God can judge us."

"It is a subtle truth that true knowledge is found not in possessing answers, but in continually asking the right questions — an essential principle for the reflective life."