In the midst of this endless variety of opinion, what man, or what body of men, has the right to say, in regard to any particular action, or course of action, "we have tried this experiment, and determined every question involved in it? We have determined it, not only for ourselves, but for all others? And, as to all those who are weaker than we, we will coerce them to act in obedience to our conclusions? We will suffer no further experiment or inquiry by any one, and, consequently, no further acquisition of knowledge by anybody?"