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 of conceiving or testing any truth or making any progress in happiness.

Thinkers of different experience and organisation have pro tanto different logics and different moral laws. There are limits to communication even among beings of the same race, and the faculties and ideals of one intelligence are not transferable without change to any other. If this historic diversity in minds were complete, so that each lived in its own moral world, a science of each of these moral worlds would still be possible provided some inner fixity or constancy existed in its meanings. In every human thought together with an immortal intent there is a mortal and irrecoverable perception: something in it perishes instantly, the part that can be materially preserved being proportionate to the stability or fertility of the organ that produced it. If the function is imitable, the object it terminates in will reappear, and two or more moments, having the same ideal, will utter comparable messages and may perhaps be unanimous. Unanimity in thought involves identity of functions and similarity in organs. These conditions mark off the sphere of rational communication and society; where they fail altogether there is no mutual intelligence, no conversation, no moral solidarity.

The inner authority of reason, however, is no more destroyed because it has limits in physical expression or because irrational things exist, than