It is the characteristic of a devotee to observe and protect the Vaisnava etiquette. Maintenance of the Vaisnava etiquette is the ornament of a devotee
Sri Caitanya-caritamrta
CC Antya-lila
CC Antya 4.129-130, Translation:
“My dear Sanātana, although you are the deliverer of the entire universe and although even the demigods and great saints are purified by touching you, it is the characteristic of a devotee to observe and protect the Vaiṣṇava etiquette. Maintenance of the Vaiṣṇava etiquette is the ornament of a devotee.