This conception at a certain moment is transformed but not substantially changed. As we begin to reflect, we notice that this nature, as known to us, is not the real external nature, the nature which is unfolded in time and space, which we see before our eyes, an object perceptible by our bodily senses. We conclude then, that nature as known to us is an _idea_; that Nature is one thing and the idea of nature another. And if we think this perceptible nature and have faith in its reality and in the reality of its determinations, this nature in which reality is made to consist is the nature which is within our thought,--the idea of nature; or in other words, thought considered as the content of our mind. This thought is the aim of all the inquiries by which we strive to become thoroughly acquainted with nature, and which we finally discover or at least ought to discover when we succeed in attaining true knowledge. We say that we know nature only when we are able to recognise an idea in nature: that is, an idea in each of its elements, and a system of ideas in the whole of nature. So that what we know is not really nature as it presents itself to our senses, still less nature as it is, before it has impressed our senses; but nature as disclosed to us by thought, as it exists in thought--i.e., the idea. And this idea must be real, otherwise nature, which has its truth in the idea, could not be real. Not only is it real, it is that reality itself which a moment ago we were led to think of as consisting in external perceptible nature. This reality makes the life of our thought possible, but it is not a product of this life. It is a condition and a prerequisite of thought, and as such it does not exist because we think it: but rather we are able to think it because it exists. It is eternal truth, at first unknown to man, then by him desired. In quest of it he gradually lifts on all sides the veil which hides it from his eyes, without however hoping that it will ever entirely disclose to him its divine countenance. According to this transformed point of view, then, reality, which in the first instance appeared to be natural, that is physical or material, has now become ideal. But even thus it remains extraneous to thought, and unconcerned with the presence or the absence of it; transcending the entire life of the human spirit, and incessantly subject to the danger of error. Whereas the idea as a complexus of all ideas that can be thought (but have not been thought, or rather have not all been thought) is the beacon of light that guides the way of man in the ocean of life; it is Truth pure and perfect.