"A conditioned soul should not imitate the activities of liberated souls."Srila Prabhupada sb/2/7/53
"One who imitates the symptoms of an uttama-adhikārī may serve another's outward body for the purpose of fame or material reward, but he does not serve the spirit soul. Such an imitator can have no information of the spiritual world."
Srila Prabhupada iso/iso_6
"One’s longevity, opulence, beauty, education and whatever else one may possess as a result of pious activities cannot protect one if one commits an offense at the lotus feet of a Vaiṣṇava. Despite whatever one possesses, if one offends the lotus feet of a Vaiṣṇava he will be vanquished."
sb/7/4/28
"Rāvaṇa was raised to an exalted position as the king of a great kingdom with all material opulences, but because of his sinful act of kidnapping mother Sītā, all the results of his pious activities were destroyed. If one offends an exalted personality, especially the Supreme Personality of Godhead, one certainly becomes most abominable; bereft of the results of pious activities, one must fall down like Rāvaṇa and other demons."
Srila Prabhupada sb/9/10/23
"If one offends a great personality. the Supreme Personality of Godhead does not excuse one, although the great personalities themselves might not take offense."
Srila Prabhupada /sb/5/13/23
"So if you insult your ācārya, then you are finished. Yasya prasādād bhagavat-prasādo yasya aprasādāt na gatiḥ kuto 'pi **—finished. If you displease your ācārya, then you are finished."
Srila Prabhupada Śrī Caitanya-caritāmṛta, Ādi-līlā 1.13
—
Māyāpur, April 6, 1975