This essay explores the philosophical insights of Zhu Xi, Wang YangMing, Kant, and Husserl and therefore proposes a new epistemic constructivism. It demonstrates that a knowing mind is a constructor, not merely a mirror-like copier or a camera-like copier in the experience of knowing. It argues that just as different kinds of machine produce kinds of product of different qualities, different kinds of mind produce different kinds of knowledge; to know X is to construct belief and understanding of X that has truth. Therefore, while Kant correctly indicated that before we set out to know things in the world, we should inquire what the mind can know, Confucian masters profoundly suggest that in order to know things in the world and know better, we should constantly expand our mind to the extent that it is broad(博), great(大), refined(精)and profound (深)so that our mind can know millions of things in the world.