Truth cannot be taught... but it can be learned. And between these two sentences is the key of all understanding. So let me repeat: truth cannot be taught, but it can be learned – because truth is not a teaching, not a doctrine, not a theory, a philosophy, or something like that. Truth is existence.
Truth is BEING. Nothing can be said about it.
It can be encountered directly, but not through about. There is no VIA MEDIA.
Truth is here and now. Only truth is. Nothing else exists. So the moment you raise a question about it the mind has already moved away. You are somewhere else, not here and now.
Truth cannot be taught because words cannot convey it. Words are impotent. Truth is vast, tremendously vast, infinite. Words are very very narrow. You cannot force truth into words, it is impossible. And how is one going to teach without words?