“Formerly I was led by feelings such as those just referred to [referring to deep inward convictions of awe and religious experience], to the firm conviction of the existence of God, and of the immortality of the soul. In my journal I wrote that whilst standing in the midst of the grandeur of a Brazilian forest, ‘it is not possible to give an adequate idea of the higher feelings of wonder, admiration, and devotion, which fill and elevate the mind.’ I well remember my conviction that there is more in man than the mere breath of his body. But now the grandest scenes would not cause any such convictions and feelings to rise in my mind. It would be truly said that I am like a man who has become colour-blind…”

_Charles Darwin, (Autobiography)