From Hegel’s Phenomenology of Mind:

Precisely for the reason that existence is designated a species or kind, it is naked simple thought: nous, simplicity, is substance. It is on account of its simplicity, its self-identity, that it appears steady, fixed, and permanent. But this self-identity is likewise negativity; hence that fixed and stable existence carries the process of its own dissolution within itself. The determinateness appears at first to be so solely through its relation to something else; and its process seems imposed and forced upon it externally. But its having its own otherness within itself, and the fact of its being a self-initiated process — these are implied in the very simplicity of thought itself. For this is self-moving thought, thought that distinguishes, is inherent inwardness, the pure notion. Thus, then, it is the very nature of understanding to be a process; and being a process it is Rationality.

In the nature of existence as thus described — to be its own notion and being in one — consists logical necessity in general. This alone is what is rational, the rhythm of the organic whole: it is as much knowledge of content as that content is notion and essential nature. In other words, this alone is the sphere and element of speculative thought. The concrete shape of the content is resolved by its’ own inherent process into a simple determinate quality. Thereby it is raised to logical form, and its being and essence coincide; its concrete existence is merely this process that takes place, and is eo ipso logical existence. It is therefore needless to apply a formal scheme to the concrete content in an external fashion; the content is in its very nature a transition into a formal shape, which, however, ceases to be formalism of an external kind, because the form is the indwelling process of the concrete content itself.

This nature of scientific method, which consists partly in being inseparable from the content, and partly in determining the rhythm of its movement by its own agency, finds, as we mentioned before, its peculiar systematic expression in speculative philosophy.