Phenomenology of Spirit, Preface, paragraph 40

Dogmatism as a way of thinking, whether in ordinary knowledge or in the study of philosophy, is nothing else but the view that truth consists in a proposition, which is a fixed and final result, or again which is immediately known. To questions like, “when was Caesar born?”, “how many feet make a furlong?”, etc., a straight answer ought to be given; just as it is absolutely true that the square of the hypotenuse is equal to the sum of the squares of the other two sides of a right triangle. But the nature of such a so-called truth is different from the nature of philosophical truths.