Experience is, first and foremost, of objects, space and time. Space is inferred from the relationships of objects. Time is inferred from the change in the relationship of objects in space. Reality is the entirety of objects, space and time.

Nothing is known without experience.

Knowledge is from the sense faculties and the mental faculty.

Objects and entities are not the same. There are three kinds of entities: physical, mental and semantic entities. When one observes a rock, one creates a mental representation of it, and one may associate it with the semantic representation of the spoken or written word, symbol or image.

By objects I mean physical entities. To ignore physical entities has consequences. To ignore mental or semantic entities does not have consequences.

A rock thrown at you may harm you. The thought of a rock being thrown at you cannot harm you. The word expressed out loud will not directly harm you either. In short, only physical entities have ontological status, and knowledge is of all the entities.