Verse
इदं ते नातपस्काय नाभक्ताय कदाचन ।न चाशुश्रूषवे वाच्यं न च मां योऽभ्यसूयति ॥
idaṃ te nātapaskāya nābhaktāya kadācanana cāśuśrūṣave vācyaṃ na ca māṃ yo’bhyasūyati
Never is this to be spoken by thee to one without askesis, not to one that is not devoted and not to him who does no service; nor yet to him who despises and belittles Me (lodged in the human body).
Gītā 18·67