Thus not only is the passage of nature an essential character of nature in its _role_ of the terminus of sense-awareness, but it is also essential for sense-awareness in itself.

It is this truth which makes time appear to extend beyond nature.

But what extends beyond nature to mind is not the serial and measurable time, which exhibits merely the character of passage in nature, but the quality of passage itself which is in no way measurable except so far as it obtains in nature.

That is to say, 'passage' is not measurable except as it occurs in nature in connexion with extension.

In passage we reach a connexion of nature with the ultimate metaphysical reality.