"Everything in Irenaeus is bathed in a warm and radiant joy, a wise and majestic gentleness. His words of struggle are hard as iron and crystal clear, ... so penetrating that they cannot fail to enlighten the unbiased observer."

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It is clear that everybody interested in science must be interested in world 3 objects. A physical scientist, to start with, may be interested mainly in world 1 objects--say crystals and X-rays. But very soon he must realize how much depends on our interpretation of the facts, that is, on our theories, and so on world 3 objects. Similarly, a historian of science, or a philosopher interested in science must be largely a student of world 3 objects.

— Karl Popper