My friends, whether you will be the happier for any knowledge of physical science, or for any other knowledge whatsoever, I cannot tell. That lies in the decision of a higher Power than I; and, indeed, to speak honestly, I do not think that any branch of physical science is likely, at first at least, to make you happy. Neither is the study of your fellow-men. Neither is religion itself. We were not sent into the world to be happy, but to be right -- at least, poor creatures that we are -- as right as we can be, and we must be content with being right, and not happy. . . . And we shall be made truly wise if we be made content; content, too, not only with what we can understand, but content with what we do not understand -- the habit of mind which theologians call (and rightly) faith in God, true and solid faith, which comes often out of sadness and out of doubt.

Lecture on Bio-geology. 1869.