The same thing is valid with regard to the things of value in life; in these, also, sense and spirit are not simply combined; but something of sense becomes a spiritual good only so far as it serves the spiritual life in some way; it cannot do this, however, without itself undergoing a transformation. This is to be seen nowhere more clearly than in economics. Money and estate had at all times a value for self-preservation and enjoyment, but in the doctrine of economics and political economy they could obtain acknowledgment only after a power to advance the spiritual life had been recognised in them. As culture in the ancient world had not yet reached this point of view, it branded all endeavour after material wealth as inferior, and as far as possible checked such endeavour. Only since the Modern Age has recognised in money and estate an indispensable means of gaining control over the surrounding world and of increasing human power have they secured a place within the spiritual life, and as a result of this have become more highly estimated. At the same time, however, they have been changed inwardly in the process, since that which they achieve, not towards ostentatious display and enjoyment, but towards the increase of human power over things has become the chief matter. As in this way the content and the value of that which is offered by the world of sense shows its dependence upon the condition of the spiritual life, so in science also a similar relation between experience and the spiritual life is found. Science appeals to experience with particular zeal, more especially after it has first accomplished far-reaching changes in its own thought constructions; only then does experience give anything new to knowledge and exhibit a greater depth. Experience can answer only in the measure in which it is questioned; the question, however, varies according to the stage of development of the spiritual life. Such a view fully appreciates the significance of life-work, and must strive energetically to gain its acknowledgment. This work is not a carrying out of a complete scheme in a given condition of things, an application of firmly rooted principles to particular cases, but a self-realisation and self-perfecting of the spiritual life which builds up a self-conscious reality. In this our life is not divided between two different realms, but, in a comprehensive spiritual world, different stages of reality meet together, which must be brought into relation and developed. To be sure, the world of sense retains a certain independence; it resists a complete transformation into spiritual magnitudes, and our life, therefore, retains a certain restriction and impenetrability. But the self-consciousness of the spirit becomes more and more the chief basis and sphere of life: this self-consciousness continually takes up more into itself; it makes the world that was to us at first primary, indeed the only world, more and more secondary and subordinate.