The mere accumulation of trivial facts, the critics said, did not constitute valuable knowledge.

He defined the ideal as being mental pictures that constitute subjective knowledge.

And the criteria for what should be found - what constitutes knowledge - is in the end an epistemological question.

There is no Truth, nor any unambiguous criterion for agreeing upon what constitutes correct knowledge about society.

From the experience of material relations an abstraction to ideas can be made which will constitute knowledge of the world.

But what justification could God have for believing the propositions that are supposed to constitute middle knowledge?

Only knowledge of the Forms constitutes real knowledge.

Further they are entirely individual, and can in no way be described as constituting absolute objective knowledge.

The article Knowledge (philosophy) discusses the view of philosophers on how one can tell which beliefs constitute actual knowledge.

What constitutes knowledge, certainty and truth are controversial issues.