To understand this for sense it is not required that a man should be a geometrician or a logician, but that he should be mad.
Thomas HobbesBy this we may understand, there be two sorts of knowledge, whereof the one is nothing else but sense, or knowledge original (as I have said at the beginning of the second chapter), and remembrance of the same; the other is called science or knowledge of the truth of propositions, and how things are called, and is derived from understanding.
Thomas Hobbes