 Husserl’s characterization of logical laws as known a priori also met with opposition. According to Gerardus Heymans, all epistemology can say, for the time being, with respect to a logical law like the Principle of Non-Contradiction is that ‘probably all human beings reject contradiction’ (1905, 66). Our knowledge of logical laws is more probable than our knowledge of other psychological laws only ‘because we experiment, throughout our life, daily and every hour, with these elementary relations between phenomena of consciousness’ (1905, 33).