“Blind nature will nearly always select the most probable, but man can let the most improbable become actual.”

“Hardest of all, as one becomes older, is to accept that sapient remarks can be drawn from the most unwelcome or seemingly improbable sources, and that the apparently more trustworthy sources can lead one astray.”

“Smoking will probably kill me, but so will natural selection.”

“I think it inevitably follows, that as new species in the course of time are formed through natural selection, others will become rarer and rarer, and finally extinct. The forms which stand in closest competition with those undergoing modification and improvement will naturally suffer most.”

“I would not think that philosophy and reason themselves will be man's guide in the foreseeable future; however, they will remain the most beautiful sanctuary they have always been for the select few.”

“With respect to the requirement of art, the probable impossible is always preferable to the improbable possible.”