What about a person who on hearing the teachings of emptiness and no-self has no reaction at all and appears dull, displaying neither confidence nor repugnance? On this point, the great master Tsongkhapa said in his commentary on Introduction to the Middle Way that without clairvoyant power, a teacher cannot ascertain a person’s capacity nor know the extent to which the teachings on emptiness can be expounded. Nonetheless, a person who has genuine respect for a spiritual friend or guru and adheres strictly to the guru’s every word is also qualified to receive the teachings on emptiness, even if the person does not exhibit the kind of reactions mentioned above.

Why is that? Although the wisdom capacity of this type of person is not yet mature, they have deep faith in their spiritual friend; they accept whatever the spiritual friend says and whatever is taught by the buddhas and bodhisattvas. In their minds, there cannot possibly be any mistake in the teachings of the guru and that of the buddhas and bodhisattvas; even if they do not understand emptiness at the moment, they can accept the concept. Hence, it is also fine to teach emptiness to this kind of person.

- Quote from The Four Seals of Dhama, "All Phenomena Lack Self-Existence"