William Bateson quotes:

I would trust Shakespeare, but I would not trust a committee of Shakespeares.

When students of other sciences ask us what is now currently believed about the origin of species, we have no clear answer to give. Faith has given way to agnosticism. Meanwhile, though our faith in evolution stands unshaken we have no acceptable account of the origin of species.

Though we must hold to our faith in the evolution of species, there is little evidence as to how it has come about, and no clear proof that the process is continuing in any considerable degree at the present time.

Treasure your exceptions.

If I may throw out a word of counsel to beginners, it is: Treasure your exceptions! When there are none, the work gets so dull that no one cares to carry it further. Keep them always uncovered and in sight. Exceptions are like the rough brickwork of a growing building which tells that there is more to come and shows where the next construction is to be.