[187] Plato, who supposes any knowledge worth the name to be "absolute and eternal"; whose constant contention it is, to separate longo intervallo, by the longest possible interval, science (epistêmê)+ as the possession of irresistible truth, from any and every sort of knowledge which falls short of that; would hardly have accepted the suggestion of Lessing. Yet, in spite of all that, in spite of the demand he makes for certainty and exactness and what is absolute, in all real knowledge, he does think, or inclines his reader to think, that truth, precisely because it resembles some high kind of relationship of persons to persons, depends a good deal on the receiver; and must be, in that degree, elusive, provisional, contingent, a matter of various approximation, and of an "economy," as is said; that it is partly a subjective attitude of mind:--that philosophic truth consists in the philosophic temper. "Socrates in Plato," remarks Montaigne acutely, "disputes, rather to the profit of the disputants, than of the dispute. He takes hold of the first subject, like one who has a more profitable end in view than to explain it; namely, to clear the understandings that he takes upon him to instruct and exercise." Just there, in fact, is the justification of Plato's peculiar dialectical method, of its inexactness, its hesitancy, its scruples and reserve, as if he feared to obtrude knowledge on an unworthy receiver. The treatise, as the proper instrument of dogma [188] --the Ethics of Aristotle, the Ethics of Spinoza--begins with a truth, or with a clear conviction of truth, in the axiom or definition, which it does but propose further to explain and apply.--The treatise, as the instrument of a dogmatic philosophy begins with an axiom or definition: the essay or dialogue, on the other hand, as the instrument of dialectic, does not necessarily so much as conclude in one; like that long dialogue with oneself, that dialectic process, which may be co-extensive with life. It does in truth little more than clear the ground, as we say, or the atmosphere, or the mental tablet, that one may have a fair chance of knowing, or seeing, perhaps: it does but put one into a duly receptive attitude towards such possible truth, discovery, or revelation, as may one day occupy the ground, the tablet,--shed itself on the purified air; it does not provide a proposition, nor a system of propositions, but forms a temper.