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 the better method of overcoming erratic ideas is to trace them out dialectically and see if they will not recognise their own fatuity. The most irresponsible vision has certain principles of order and valuation by which it estimates itself; and in these principles the Life of Reason is already broached, however halting may be its development. We should lead ourselves out of our dream, as the Israelites were led out of Egypt, by the promise and eloquence of that dream itself. Otherwise we might kill the goose that lays the golden egg, and by proscribing imagination abolish science.

Visionary experience has a first value in its possible pleasantness. Why any form of feeling should be delightful is not to be explained transcendentally: a physiological law may, after the fact, render every instance predictable; but no logical affinity between the formal quality of an experience and the impulse to welcome it will thereby be disclosed. We find, however, that pleasure suffuses certain states of mind and pain others; which is another way of saying that, for no reason, we love the first and detest the second. The polemic which certain moralists have waged against pleasure and in favour of pain is intelligible when we remember that their chief interest is edification, and that ability to resist pleasure and pain alike is a valuable virtue in a world where action and renunciation are the twin keys to happiness. But to deny that pleasure is a good and pain an evil