Herein the reason for foolishness is described. Because the conditioned soul in this material world is full of materialistic lusty desires, he cannot understand the Supreme Personality of Godhead, although the Lord is situated in everyone’s heart ( īśvaraḥ sarva-bhūtānāṁ hṛd-deśe ’rjuna tiṣṭhati ). It is because of this foolishness that one cannot take instructions from the Lord, although the Lord is ready to instruct everyone both externally and internally. The Lord says, dadāmi buddhi-yogaṁ tam yena mām upayānti te. In other words, the Lord can give instructions on devotional service by which one can return home, back to Godhead. Unfortunately, however, people do not take this devotional service. The Lord, being situated in everyone’s heart, can give one complete instructions on going back to Godhead, but because of lusty desires one engages himself in materialistic activities and does not render service to the Lord. Therefore one is bereft of the value of the Lord’s instructions. By mental speculation one can understand that one is not the body but a spirit soul, but unless one engages in devotional service, the real purpose of life is never fulfilled. The real purpose of life is to go back home, back to Godhead, and live with the Supreme Personality of Godhead, play with the Supreme Personality of Godhead, dance with the Supreme Personality of Godhead and eat with the Supreme Personality of Godhead. These are different items of ānanda, spiritual happiness in spiritual variegatedness. Even though one may come to the platform of brahma-bhūta. and understand his spiritual identity by speculative knowledge, one cannot enjoy spiritual life without understanding the Supreme Personality of Godhead. This is indicated here by the word abhīṣṭa-siddhiḥ. One can fulfill the ultimate goal of life only by engaging in devotional service to the Lord. Then the Lord will give one proper instructions on how to go back home, back to Godhead.