"Nature has put itself the problem of how to catch in flight light streaming to the Earth and to store the most elusive of all powers in rigid form. The plants take in one form of power, light; and produce another power, chemical difference."

“Were it not for this inalterable armony, pre-established by God, between subject and object, all our thinking would be necessarily without fruit.”

“My early feeling that scientific truths are to the Christian religion much what brooks and rivers are to the ocean, has become my most vital conviction. Tempted as I was to drift with the tempest of passion, I had made shipwreck in these latter years, had not in my heaviest hours the Mercy of God, through your instrumentality, kept me always on the right path.”

“With heartfelt conviction I say it: A sound philosophy must and can be nothing else than a propaedeutic to Christianity.”