2. Logical delirium, a speciality of the second-rate mind, is the humourless application of irrelevant theory to uncomprehended reality.
3. Progress does not consist in replacing a theory that is wrong with one that is right. It consists in replacing a theory than is wrong with one that is more subtly wrong.
4. The number of different hypotheses erected to explain a given phenomenon is inversely proportional to the available knowledge.
5. A mind all logic is like a knife all blade. It makes the hand bleed that uses it. (Rabindranath Tagore).