If we are to survive, our loyalties must be broadened further, to include the whole human community, the entire planet Earth.

'In his celebrated book, 'On Liberty', the English philosopher John Stuart Mill argued that silencing an opinion is "a peculiar evil." If the opinion is right, we are robbed of the "opportunity of exchanging error for truth"; and if it's wrong, we are deprived of a deeper understanding of the truth in its "collision with error." If we know only our own side of the argument, we hardly know even that: it becomes stale, soon learned by rote, untested, a pallid and lifeless truth.'

We have entered, almost without noticing, an age of exploration and discovery unparalleled since the Renaissance.

Any faith that admires truth, that strives to know God, must be brave enough to accommodate the universe.

Our perceptions are fallible. We sometimes see what isn't there. We are prey to optical illusions. Occasionally we hallucinate. We are error-prone.

I consider it an extremely dangerous doctrine, because the more likely we are to assume that the solution comes from the outside, the less likely we are to solve our problems ourselves.

Science is a way of thinking that helps you not to fool yourself.