My own opinion is, that the class of writers of whom I have been speaking, have themselves as little misgiving about the truths which they pretend to weigh out and measure, as their unsophisticated neighbours; but they think it a duty to remind us, that since the full etiquette of logical requirements has not been satisfied, we must believe those truths at our peril. They warn us, that an issue which can never come to pass in matter of fact, is nevertheless in theory a possible supposition. They do not, for instance, intend for a moment to imply that there is even the shadow of a doubt that Great Britain is an island, but they think we ought to know, if we do not know, that there is no proof of the fact, in mode and figure, equal to the proof of a proposition of Euclid; and that in consequence they and we are all bound to suspend our judgment about such a fact, though it be in an infinitesimal degree, lest we should seem not to love truth for truth’s sake. Having made their protest, they subside without scruple into that same absolute assurance of only partially-proved truths, which is natural to the illogical imagination of the multitude. 4. It remains to explain some conversational expressions, at first sight favourable to that doctrine of degrees in assent, which I have been combating. (1.) We often speak of giving a modified and qualified, or a presumptive and _primâ facie_ assent, or (as I have already said) a half-assent to opinions or facts; but these expressions admit of an easy explanation. Assent, upon the authority of others is often, as I have noticed, when speaking of notional assents, little more than a profession or acquiescence or inference, not a real acceptance of a proposition. I report, for instance, that there was a serious fire in the town in the past night; and then perhaps I add, that at least the morning papers say so;—that is, I have perhaps no positive doubt of the fact; still, by referring to the newspapers I imply that I do not take on myself the responsibility of the statement. In thus qualifying my apparent assent, I show that it was not a genuine assent at all. In like manner a _primâ facie_ assent is an assent to an antecedent probability of a fact, not to the fact itself; as I might give a _primâ facie_ assent to the Plurality of worlds or to the personality of Homer, without pledging myself to either absolutely. “Half-assent,” of which I spoke above, is an inclination to assent, or again, an intention of assenting, when certain difficulties are surmounted. When we speak without thought, assent has as vague a meaning as half-assent; but when we deliberately say, “I assent,” we signify an act of the mind so definite, as to admit of no change but that of its ceasing to be.