““What I am thinking of is the man of imagination and science, whose courage is infinite because his curiosity surpasses his courage. Nothing will keep him back...Any true scientist (not, of course,the fraudulent mediocrity, whose only treasure is the ignorance he hides like a bone) should be capable of experiencing that sensuous pleasure of direct and divine knowledge. He may be twenty and he may be eighty-five but without that tingle there is no science.””