A word may be devoted to the simple refusal of intuitionists to give an account of Truth on the ground that it is 'indefinable.' Truth is taken to be an ultimate unanalyzable quality of certain propositions, intuitively felt, and incapable of description. Error, by the same token, should be equally indefinable and as immediately apprehended. How, then, can there be differences of opinion, and mistakes as to what is true and what false? How is it that a proposition which is felt to be 'true' so often turns out to be erroneous? If all errors are felt to be true by those they deceive, is it not clear that immediate feeling is not a good enough test of a validated truth? Thus, once again, we find that an account of truth-claim is being foisted on us in place of a description of truth-testing. The intellectualist, then, being in every case unable to justify the vital distinction commonly made between the true and the false, we return to the pragmatist. He starts with no preconceptions as to what truth must mean, whether it exists or not; he is content to watch how _de facto_ claims to truth get themselves validated in experience. He observes that every question is intimately related to some scheme of human purposes. For it has to be _put_, in order to come into being. Hence every inquiry arises, and every question is asked, because of obstacles and problems which arise in the carrying out of human purposes. So soon as uncertainty arises in the course of fulfilling a purpose, an idea or belief is formulated _and acted on_, to fill the gap where immediate certitude has broken down. This engenders the truth-claim, which is necessarily a 'good' in its maker's eyes, because it has been selected by him and judged _preferable_ to any alternative that occurred to him.