नास्ति बुद्धिरयुक्तस्य न चायुक्तस्य भावना।
न चाभावयतः शान्तिरशान्तस्य कुतः सुखम्।।2.66।।
।।2.66।। (संयमरहित) अयुक्त पुरुष को (आत्म) ज्ञान नहीं होता और अयुक्त को भावना और ध्यान की क्षमता नहीं होती भावना रहित पुरुष को शान्ति नहीं मिलती अशान्त पुरुष को सुख कहाँ
Lord Krishna is explaining the defects due to the absence of happiness as referred to in this verse. Without being happy there is no possibility of concentration of the mind. Without concentration of the mind there can be no meditation and without meditation it is not possible to have inner awakening or soul-cognition. Therefore it has been declared that these things are not possible for one without concentration. Santih or peace refers also to liberation. Santi, moksa or liberation and nirvana all have a similar meaning denoting termination of the samsara or worldly existence.
