Practical Vedanta

by Vivekananda

I see a black-board. How does the knowledge come? What the German philosophers call “the thing-in-itself” of the blackboard is unknown, I can never know it. Let us call it x. The black-board x acts on my mind, and the mind reacts. The mind is like a lake. Throw a stone in a lake and a reactionary wave comes towards the stone; this wave is not like the stone at all, it is a wave. The black-board x is like a stone which strikes the mind and the mind throws up a wave towards it, and this wave is what we call the black-board. I see you. You as reality are unknown and unknowable. You are x and you act upon my mind, and the mind throws a wave in the direction from which the impact comes, and that wave is what I call Mr. or Mrs. So-and-so. There are two elements in the perception, one coming from outside and the other from inside, and the combination of these two, x + mind, is our external universe. All knowledge is by reaction.