불가지론 (不可知論)

Agnosticism, in fact, is not a creed, but a method, the essence of which lies in the rigorous application of a single principle... Positively the principle may be expressed: In matters of the intellect, follow your reason as far as it will take you, without regard to any other consideration. And negatively: In matters of the intellect, do not pretend that conclusions are certain which are not demonstrated or demonstrable. That I take to be the agnostic faith, which if a man keep whole and undefiled, he shall not be ashamed to look the universe in the face, whatever the future may have in store for him.

- Thomas Henry Huxley (1825 ~ 1895), an English biologist well known as 'Darwin's Bulldog' for his advocacy of Charles Darwin's theory of evolution, first coined the word 'Agnosticism' distinguished himself from the conventional atheism, as quoted,

"Others were quite sure they had attained a certain 'gnosis' - had, more or less successfully, solved the problem of existence; while I was quite sure I had not, and had a pretty strong conviction that the problem was insoluble. And, with Hume and Kant on my side, I could not think myself presumptuous in holding fast by that opinion. So i took thought, and invented what I conceived to be the appropriate title of 'agnostic'."