“An indispensable prerequisite for insight is to use the wisdom gained through study and reflection to develop knowledge of reality. For without a decisive view of how things exist, you cannot develop insight that knows the real nature, emptiness.
Moreover, if you do not rely upon the treatises by authoritative trailblazers commenting on the Budddha’s thought, you are like a blind person headed towards danger without a guide. Hence, you must rely on accurate commentaries on the Buddha’s thought.”
(Tsong-kha-pa. 2002. “Fulfilling the Prerequisites for Insight.” In The Great Treatise on the Stages of the Path to Enlightenment Volume 3, 111-112. Snow Lion Publications.)