A devotee is never a cause of distress to anyone

A Krishna conscious person, being naturally purified, has no need of developing any other purificatory process of thought or action. On account of his being highly elevated in Krishna consciousness, he has already acquired all the good qualities and is following the rules and regulations prescribed for the mystic yogic process. Such rules are automatically practiced by the devotees. A concrete example is the quality of nonviolence, which is considered a good qualification. A devotee is naturally nonviolent and therefore doesn’t have to practice nonviolence separately. Some people seek purification by joining a vegetarian movement, but a devotee is automatically a vegetarian. He doesn’t need to practice separately in this matter or to join any society for vegetarians. He is automatically a vegetarian.

There are many other instances showing that a devotee needn’t practice anything but Krishna consciousness; all the good qualities of the demigods automatically develop within him. Those who are intentionally practicing to be vegetarians or to become nonviolent may have good qualifications by a material estimation, but these qualifications are not sufficient to make them devotees. A vegetarian is not necessarily a devotee, nor is a nonviolent person. But a devotee is automatically both vegetarian and nonviolent. We must conclude, therefore, that vegetarianism or nonviolence is not the cause of devotion.

In this connection, there is a story in the Skanda Purana about a hunter who was converted into a great devotee under the instruction of Narada Muni. When the hunter became a perfect devotee, he was not prepared to kill even an ant. Parvata Muni, a friend of Narada’s, saw the wonderful transformation of the hunter by devotional service and remarked, “My dear hunter, your unwillingness to kill even an ant is not very astonishing. Any person who develops the devotional attitude has all the good qualities automatically manifested in his person. A devotee is never a cause of distress to anyone.”

Sri Rupa Gosvami affirms herein that purification of consciousness, purification of bodily activities, austerities, peace of mind, etc., all become automatically manifest in the person who is engaged in devotional service.”
N.O.D. (Nectar of Devotion OR Bhakti-Rasamrta-Sindhu), Ch 14, Devotional Qualifications