I. Haeckel and His Opponents

“What thinkable connection exists between the definite movements of definite atoms in my brain on the one hand; and, on the other, those for me primary, not further definable, not to be denied facts: ‘I feel pain, I feel pleasure, I taste something sweet, smell the odour of roses, hear the sound of an organ, see red,’ and the equally immediate certainty flowing therefrom, ‘therefore I am!’? It is just entirely and for ever incomprehensible that it should not be indifferent to a number of carbon, oxygen, nitrogen, hydrogen, etc., atoms, how they lie and move, how they lay and moved, how they will lie and move.”