Bhagavad Gita · Chapter 3: The Path of Action
Bhagavad Gita 3.31
ये मे मतमिदं नित्यमनुतिष्ठन्ति मानवाः ।
श्रद्धावन्तोऽनसूयन्तो मुच्यन्ते तेऽपि कर्मभिः ॥
ye me matamidaṃ nityamanutiṣṭhanti mānavāḥ | śraddhāvanto'nasūyanto mucyante te'pi karmabhiḥ ||
Those who always follow this teaching of mine, with faith and without finding fault, are also freed from the bondage of actions.
Modern context
Two attitudes make a teaching work: trust enough to try it, and freedom from the habit of fault-finding. Neither is blind belief. Trust here is the willingness to practise before judging, as a patient follows a course of treatment before deciding whether it helps.