Soul receives from soul that knowledge, therefore, not by book, nor from tongue. If knowledge of mysteries comes after emptiness of mind, that is illumination of heart.
Those who read books cannot understand the teachings and, what’s more, may even go astray. But those who try to observe the things going on in the mind, and always take that which is true in their own minds as their standard; never get muddled.
One whose knowledge is confined to books and whose wealth is in the possession of others, can use neither his knowledge nor wealth when the need for them arises.
If you seek to understand the whole universe you will understand nothing at all but seek to understand yourself and you will understand the whole universe.
Ignorance is the failure to discriminate between permanent and impermanent, pure and impure, bliss and suffering, Self and non-Self.

