“Bhaktisiddhanta Sarasvati Thakura and his beloved disciple, His Divine Grace A.C. Bhaktivedanta Swami Prabhupada, the Founder-Acarya of the International Society for Krishna Consciousness, are “sages” or bona fide spiritual masters whose instructions are Transparent Windows to the Spiritual World.
Where blindly following can cause mishap, one is protected by carefully comprehending the instructions of the previous spiritual masters and the Vedic literatures using reasoning and logic. Logical reflection on the teachings of Krishna is recommended, while mental speculation based on material conceptions and blind sentiments are forbidden.
On the long journey back to Godhead, who but a fool would travel without a map, without a guide? However, when a devotee has a bonafide spiritual master and the Vedic literatures as his guide and yet instead listens to his false ego, that is even more foolish..”HH Jayapataka Swami From the book: Vaishnava Ke
Verse 19 – Purport