Similarly, in the case of belief, true belief was held to be that which men in general, or in the long run, or on the average, hold true, as distinguished from what the individual under variable and accidental influences holds true.

And even in the case of introspection we found that true cognition resolved itself into a consensus or agreement as to certain psychical facts.
_Criterion of Illusion._ Now, it behoves us here to examine this assumption, with the view of seeing how far it is perfectly sound.

For it may be that what is commonly held true does not in all cases strictly answer to the real, in which case our idea of illusion would have to be extended so as to include certain common beliefs.

This question was partly opened up at the close of the last chapter.

It will be found that the full discussion of it carries us beyond the scientific point of view altogether.