There are many virtues in books, but the essential value is the adding of knowledge to our stock by the record of new facts, and, better, by the record of intuitions which distribute facts, and are the formulas which supersede all histories.
The mind can assert anything and pretend it has proved it. My beliefs I test on my body, on my intuitional consciousness, and when I get a response there, then I accept.
There are ages in which the rational man and the intuitive man stand side by side, the one in fear of intuition, the other with scorn for abstraction. The latter is just as irrational as the former is inartistic.
Intuition and concepts constitute... the elements of all our knowledge, so that neither concepts without an intuition in some way corresponding to them, nor intuition without concepts, can yield knowledge.