Buddha has talked about five ways to reach truth. The first he calls the way of SHEELA, the way of morality, character, virtue. The second he calls the way of knowledge. The third he calls the way of DHYANA, meditation; the fourth he calls the way of devotion; and the fifth he calls ASHEKSHA –that which cannot be taught.
That fifth is Tao. It cannot be taught. It can be learned but it cannot be taught.