In Greek philosophy the situation is far more auspicious. The ancients led a rational life and envisaged the various spheres of speculation as men might whose central interests were rational. In physics they leaped at once to the conception of a dynamic unity and general evolution, thus giving that background to human life which shrewd observation would always have descried, and which modern science has laboriously rediscovered. Two great systems offered, in two legitimate directions, what are doubtless the final and radical accounts of physical being. Heraclitus, describing the immediate, found it to be in constant and pervasive change: no substances, no forms, no identities could be arrested there, but as in the human soul, so in nature, all was instability, contradiction, reconstruction, and oblivion. This remains the empirical fact; and we need but to rescind the artificial division which Descartes has taught us to make between nature and life, to feel again the absolute aptness of Heraclitus’s expressions. These were thought obscure only because they were so disconcertingly penetrating and direct. The immediate is what nobody sees, because convention and reflection turn existence, as soon as they can, into ideas; a man who discloses the immediate seems profound, yet his depth is nothing but innocence recovered and a sort of intellectual abstention. Mysticism, scepticism, and transcendentalism have all in their various ways tried to fall back on the immediate; but none of them has been ingenuous enough. Each has added some myth, or sophistry, or delusive artifice to its direct observation. Heraclitus remains the honest prophet of immediacy: a mystic without raptures or bad rhetoric, a sceptic who does not rely for his results on conventions unwittingly adopted, a transcendentalist without false pretensions or incongruous dogmas. [Sidenote: Heraclitus and the immediate.] The immediate is not, however, a good subject for discourse, and the expounders of Heraclitus were not unnaturally blamed for monotony. All they could do was to iterate their master’s maxim, and declare everything to be in flux. In suggesting laws of recurrence and a reason in which what is common to many might be expressed, Heraclitus had opened the door into another region: had he passed through, his philosophy would have been greatly modified, for permanent forms would have forced themselves on his attention no less than shifting materials. Such a Heraclitus would have anticipated Plato; but the time for such a synthesis had not yet arrived. [Sidenote: Democritus and the naturally intelligible.]