Knower and known ...

... Putting Man Before Descartes. (Hat tip, Dave Lull.)

What science amounts to is a probabilistic kind of knowledge with its own limits, because of the limitations of the human mind, including the mental operations and the personal character of scientists themselves, which could range from sublime to fallible. There is only one kind of knowledge, human knowledge, with the inevitability of its participation, with the inevitable relationship of the knower to the known, of what and how and why and when a man knows and wishes to know.