One verse

Srimad Bhagavatam 6.9.50

6.9.50

स्वयं नि:श्रेयसं विद्वान् न वक्त्यज्ञाय कर्म हि । न राति रोगिणोऽपथ्यं वाञ्छतोऽपि भिषक्तम: ॥ ५० ॥

svayam nihsreyasam vidvan na vakty ajnaya karma hi na rati rogino ’pathyam vanchato ’pi bhisaktamah

svayam
personally
nihsreyasam
the supreme goal of life, namely the means of obtaining ecstatic love for the Supreme Personality of Godhead
vit-van
one who is accomplished in devotional service
na
not
vakti
teaches
ajnaya
unto a foolish person not conversant with the ultimate goal of life
karma
fruitive activities
hi
indeed
na
not
rati
administers
roginah
unto the patient
apathyam
something unconsumable
vanchatah
desiring
api
although
bhisak-tamah
an experienced physician

A pure devotee who is fully accomplished in the science of devotional service will never instruct a foolish person to engage in fruitive activities for material enjoyment, not to speak of helping him in such activities. Such a devotee is like an experienced physician, who never encourages a patient to eat food injurious to his health, even if the patient desires it.