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कर्मेन्द्रियाणि सम्यम्य य आस्ते मनसा स्मरन् ।
इन्द्रियार्थान् विमूढात्मा मिथ्याचारः स उच्यते ॥ ६ ॥

karmendriyANi samyamya ya Aste manasA smaran |
indriyArthAn vimUDhAtmA mithyAcAraH sa ucyate || 6 ||

यः [yaH] The one who सम्यम्य [samyamya] controls कर्मेन्द्रियाणि [karmendriyANi] organs that are involved in activity (hands, legs, mouth…), विमूढात्मा [vimUDhAtmA] while being ignorant of the Self स्मरन् आस्ते [smaran Aste] and keeps thinking about इन्द्रियार्थान् [indriyArthAn] things that stimulate the sense organs- सः [saH] Such a person उच्यते [ucyate] is said to मिथ्याचारः [mithyAcAraH] practice in vain. About the word कर्मेन्द्रिय [karmendriya] - There are two types of organs:

1. ज्ञानेन्द्रिअय [jJAnendriaya] Organs of perception: Ears, skin, eyes, nose, tongue
2. कर्मेन्द्रिय [karmendriya] Organs of work: Hands, legs, organs of speech and the two excretory organs

Restraint and sacrifice are pretense when you still yearn for ‘what could have been’.

Without losing the influence of past deeds, a person wouldn’t have conquered his senses and his mind. When such a person sets out to realize the Self, he is still drawn towards sensual objects. He keeps thinking about those objects and turns away from the Self. Instead of realizing the Self, his purpose is diverted in other ways; his actions are also diverted towards other things.

That’s why such a person is said to practice in vain. Having started out to gain knowledge of the Self, he turns in the opposite direction and is wasted. That is the opinion expressed here.