The Bhagavad Gita - II - 66

नास्ति बुद्धिरयुक्तस्य नाचायुक्तस्य भावना।
नचाभावयत: शंति: अशान्तस्य कुतः सुखं।।

 Where is joy when the intellect is unconnected

For the one who is not rooted in the truth, the Buddhi or intellect is non-functional. When the Buddhi does not function, there is no possibility of having a firm picture of the divine self, whether in a form or without it. The Buddhi is the one that gives a definite picture. In the place of the Buddhi, the mind rules. The mind as you know is never steady. It is always wavering with its innumerable thoughts. It means, such a person knows no peace. When there is no peace of mind, where can one expect to experience bliss?
The equation goes like this - an unconnected intellect cannot have a divine glimpse of the truth. It is replaced by the wavering mind. The mind is unsteady and hence knows no peace. When there is no peace, there is no experience of bliss too!
 - SS

Bhagavad Gita - II - 65

Prasade Sarva Duhkhanam Hanirasyopa Jayate|
Prasanna Chetaso hyashu Buddhih Paryavatishthate||

In that state of divine blessedness, all sorrow is destroyed. In its place, there is a a cheerful and enthusiastic state of mind that surrounds the intellect and heart. Enthusiasm is the greatest religion. It is an offshoot of intense Shraddha and faith. Without enthusiasm, the intellect loses its fuel that makes it stand straight. When all the impurities of the mind that keep the intellect on shaky ground is gone, there is nothing else left for the mind to be steady and this steady mind is the state of a Sthitha Prajna.

- Swahilya Shambhavi.

Bhagavad Gita - II - 64

The Prasada Buddhi

Raga Dwesha Viyuktaistu Vishayan Indriyaischaran|
Atmavashyair Vidheyathma Prasadham Adhi Gacchati||

When the person who moves about in this world following the path of the sense organs, however is free from attachment and hatred, is rooted in the self alone, attains to that state of mind which is rooted in grace. For such a person, everything that comes to him in life - whether it is a person, a relationship, an event or a situation is the Prasada of the Lord. When we receive prasada at a temple or at a satsang, we are not expected to question the taste, ask for more or comment on the less sugar or more salt etc. We receive prasada as it is and just consume it, probably sharing with those who haven't received.

Likewise, for a person who neither seeks nor shuns, everything that happens is Ishwara Prasada. - Swahilya Shambhavi.

Bhagavad Gita - Chapter II - 63

The loop of error

Krodhath Bhavati Sammohaha Sammohath Smriti Vibhramaha|

Smritibhramshath Buddhi Nashaha Buddhi Nashath Pranashyati||

In continuation of the trail of destruction from desire, mentioned in the previous verse, Sri Krishna says that from anger arises delusion. Anger hides the intellect and does not make the person experience reality as it is. If you are angry with someone, then even if that person is trying to help you, you will perceive that person is against you and get more angry. When there is delusion, your memory gets corrupted. You do not remember the situations and people correctly, but as your deluded mind dictates you to remember. When the memory becomes corrupt, the intellect which makes decisions based on past memory is not having the right tools to make the correct decisions. It takes the wrong decisions because the input for its choices are wrong. When the intellect is destroyed, then everything is destroyed. You make the wrong choices and face the wrong consequences and this loop of wrong thought, wrong action and wrong results continues ininterrupted. - Swahilya Shambhavi.

Bhagavad Gita : Chapter II - 62

Attachment to objects

Dhyayato Vishayan Pumsaha Sangasteshuupa Jayate|

Sangath Sanjayate Kamaha Kamath Krodhobhi Jayate||

Once a man begins to think about material things, he gets attached to those objects. Out of that attachment is born desire and out of the desire comes anger, when there is an obstacle between you and the object you desire, then anger arises at the apparent cause of the obstacle. - SS

Bhagavad Gita : Chapter II - 61

Drawn to me

Taani Sarvani Samyamya Yukta Aseeta Matparaha|

Vashehi Yasyendriyani Tasya Pragnya Pratishtitha||

Sri Krishna tells Arjuna that by collecting all the sense organs into one focal point within and seated in yoga, meditating upon the supreme consciousness, the one who is drawn within is called a person of steady intellect. - Swahilya Shambhavi.

Bhagavad Gita : Chapter II - 60

Nature of the senses to go outward

Yatatohyapi Kaunteya Purushasya Vipaschitaha|

Indriyani Pramatheeni Haranthi Prasabham Manaha||

Arjuna, the senses are by nature prone to turbulence. Even for the most intelligent and balanced Purusha, who makes an effort towards self-realisation, when swayed by desires of the senses, the mind is dragged forcibly outward. - Swahilya Shambhavi.