Talking About Mental Speculation

“The Supreme Lord Krishna can be known by persons who are in a relationship with Him through the discharge of devotional service, like Arjuna and his successors. Persons of demonic or atheistic mentality cannot know Krishna. Mental speculation that leads one away from the Supreme Lord is a serious sin, and one who does not know Krishna should not try to comment on Bhagavad-gita.” (Shrila Prabhupada, Bhagavad-gita, 10.15 Purport)