Thesis Knowing without doing is not knowing: Wang Yangming’s strong internalism is simply correct
Where it stands
Every year I teach my students Wang Yangming's slogan that knowledge and action are one, and every year they treat it as an inspirational poster. I want to defend it as a serious thesis about moral motivation.
The usual view, in China as in the West, is that knowing comes first and acting follows, if you have enough will. Zhu Xi's programme is roughly like that: investigate things, extend your knowledge, and then make your intention sincere.
Wang said this gets the order wrong. His examples are deliberately physical. Nobody says you know pain unless you have felt it yourself. Loving a beautiful colour is not first seeing it and then deciding to love it; the seeing is already the loving. Likewise, someone who “knows” filial piety but never acts filially does not know it imperfectly. He knows about it. He has heard of it.
In the vocabulary of modern meta-ethics, this is motivational internalism in its strongest form: genuine moral judgement necessarily moves you. The person who claims to know cheating is wrong and is untouched by that has learned the sentence, not the judgement.
My thesis: Wang is right, and the common sense that “we all know what's right and just don't do it” is a confusion between hearing about the good and grasping it.
I expect two objections: that this makes internalism true by definition, and that weakness of will is obviously real. I will try to answer both. Please disagree.