इन्द्रियाणि मनो बुद्धिरस्याधिष्ठानमुच्यते | एतैर्विमोहयत्येष ज्ञानमावृत्य देहिनम् ||३-४०||
indriyāṇi mano buddhirasyādhiṣṭhānamucyate . etairvimohayatyeṣa jñānamāvṛtya dehinam ||3-40||
Chapter 3 · Verse 40
Karma Yoga
कर्मयोग
In plain words
You need to locate where your spiritual enemy hides so you can defeat it. Selfish desire takes refuge in your senses, your mind, and your intellect. From these hiding places, it spins a web of maya, or illusion, which completely bewilders you and veils your true inner wisdom, making you forget your divine nature.
Translation
3.40 The senses, the mind and the intellect are said to be its instruments. By these it overpowers the embodied self after enveloping Its knowledge.
Meaning
If the abode of the enemy is known it is ite easy to kill him. So Lord Krishna like a wise army general points out to Arjuna the abode of desire so that he may be able to attack it and kill it ite readily.
Word by word
इन्द्रियाणि the senses मनः the mind बुद्धिः the intellect अस्य its अधिष्ठानम् seat उच्यते is called एतैः by these विमोहयति deludes एषः this ज्ञानम् wisdom आवृत्य having enveloped देहिनम् the embodied.