"Srila Vyasadeva revealed these statements after perfect realization and therefore they are perfect, for liberated sages like Vyasadeva never commit errors in their rhetorical arrangements. Unless one accepts this fact, there is no use in trying to obtain help from the revealed scriptures." -- CC Adi-Lila Chapter 2 text 86 purport.
"If you concoct, 'I am more intelligent than my Guru,' 'I can make additions and alterations,' then you are finished." -- Srila Prabhupada lecture July 12, 1975 Philadelphia Pa.
"We cannot water down the philosophy to make it more palatable. Our books must remain as they are." -- Srila Prabhupada letter to Lilavati devi dasi March 31, 1977.