But whatever its defects, the classification of Linnæus was the first attempt at grouping animals together according to certain common structural cha… - Louis Agassiz

The eye of the trilobite tells us that the sun shone on the old beach where he lived; for there is nothing in nature without a purpose, and when so complicated an organ was made to receive light, there must have been light to enter it.

The facts will eventually test all our theories, and they form, after all, the only impartial jury to which we can appeal.

The world has arisen in some way or another. How it originated is the great question, and Darwin's theory, like all other attempts to explain the origin of life, is thus far merely conjectural. I believe he has not even made the best conjecture possible in the present state of our knowledge.