For T. H. Huxley, who coined the term in 1869, agnosticism was as demanding as any moral, philosophical, or religious creed. Rather than a creed, though, he saw it as a method realized through “the rigorous application of a single principle.” He expressed this principle positively as: “Follow your reason as far as it will take you,” and negatively as: “Do not pretend that conclusions are certain which are not demonstrated or demonstrable.”