All the evolution we know of proceeds from the vague to the definite.

Summary

This quote suggests that the development of organisms or ideas typically moves from a state of uncertainty or ambiguity to one of clarity and specific form. In the context of biological evolution, it implies that species gradually transition from more undefined or rudimentary forms to more structured and distinct ones over time. It can also be applicable to other areas of progress, such as scientific theories or advancements in human understanding, which often begin with incomplete or speculative ideas that eventually become more refined and precise.

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