The nineteenth century transmitted to us a conception of history that is far more peculiar in nature and far more open to attack than is usually recognised: history is represented as a great stream which takes up all individual achievements into itself, unites them, and, regardless of all human error and caprice, leads surely to its end. No genuine achievement is lost, and all gain seems to be permanent; beyond all the trouble and uncertainty of the moment appeal is made to the power which, directing and elevating, permeates the movement, clarifies and refines it. In this conception the necessity of a process that has the power of determining its own activity and making its own decision is primary. The fact that the matter is not so simple as this conception of history represents is shown by the experience of the age itself, which directly contradicts it. For according to this conception the whole past should discharge itself into the present and so impart its whole result immediately to us, and the direction that our activity ought to take should be pointed out to us with complete certainty by history. But we are distinctly aware of the extent to which this direction is a matter of question and doubt, and of the uncertainty into which we have fallen with regard to the relation of the present to the past: in the process of our investigation we saw this in particular in the division and conflict between the different systems of life. History is seen to be a difficult problem far more than a secure fact; and we are compelled to take up a new consideration of the question. In this consideration a distinct delimitation of the achievements characteristic of man is primarily necessary. Modern science already recognises a history of nature, and much that was formerly regarded as complete is now seen to be in a state of flux and movement. Since every event leaves effects behind, in the course of ages the results accumulate, develop, and act upon one another, that which comes later is conditioned by the influence of the earlier and is intelligible only in relation to it, a distinctive historical method gains currency. Geology presents to us with particular clearness a history of this type. In so far as man belongs to nature and the spiritual life has not yet developed to any degree of independence in him, he is also the subject of such a history. That which happens within him leaves behind effects that become the conditions of later occurrence. This conception of history, as determined solely by mechanical causes, is still maintained in some quarters in spite of further developments of thought. But it is not apparent from this point of view how, even with the greatest accumulation of effects, history could yield anything of gain to an inner unity, to a life from the whole: for that, man must bring with him something essentially new; and as a matter of fact this is what he does.