Why So Much Emphasis On Not Criticizing Others

“Offending or blaspheming a Vaishnava has been described as the greatest offense, and it has been compared to a mad elephant. When a mad elephant enters a garden, it ruins all the creepers, flowers and trees. Similarly, if a devotee properly executing his devotional service becomes an offender at the lotus feet of his spiritual master or a Vaishnava, his devotional service is spoiled.” (Shrila Prabhupada, Chaitanya Charitamrita, Antya 3.213 Purport)