There is no limit to the increase of experience, but theories cannot become clearer and more complete in just the same sense. The field of experience is the whole universe in all directions. Theory remains shut up within the limits of the human faculties. Hence there is no way of looking at the world, but it recurs, and the curious thing happens, that with increased experience a limited theory may again come into favour.
Theories are usually the over-hasty efforts of an impatient understanding that would gladly be rid of phenomena, and so puts in their place pictures, notions, nay, often mere words.
Theories and schools, like microbes and corpuscles, devour one another and by their strife ensure the continuity of life.[Car les théories et les écoles, comme les microbes et les globules, s’entre-dévorent et assurent, par leur lutte, la continuité de la vie.]
Quantum theory provides us with a striking illustration of the fact that we can fully understand a connection though we can only speak of it in images and parables.