“Thomas Gradgrind, sir . . . with a rule and a pair of scales, and the multiplication table always in his pocket, sir, ready to weigh and measure any parcel of human nature, and tell you exactly what it comes to. It is a mere question of figures, a case of simple arithmetic.”—Charles Dickens, Hard Times
Here is a quick test that you can use to tell if you are wrong: if you think that every thing about your position on a controversial issue is right, and that the other side of the issue is 100% in error, then you are almost certainly wrong.