Reason must approach nature with the view, indeed, of receiving information from it, not, however, in the character of a pupil, who listens to all that his master chooses to tell him, but in that of a judge, who compels the witnesses to reply to those questions which he himself thinks fit to propose. To this single idea must the revolution be ascribed, by which, after groping in the dark for so many centuries, natural science was at length conducted into the path of certain progress.
Immanuel KantThe more we come in contact with animals and observe their behaviour, the more we love them, for we see how great is their care of the young.
Immanuel KantThe light dove, cleaving the air in her free flight, and feeling its resistance, might imagine that its flight would be still easier in empty space.
Immanuel Kant