As it is necessary for one to become very active in family life, similarly, after retirement from family life, it is necessary to control the mind and senses. This is possible when one engages himself fully in the devotional service of the Lord.
-SB 4.23.4, Translation and Purport

धृतराष्ट्र उवाच
धर्मक्षेत्रे कुरुक्षेत्रे समवेता युयुत्सव: ।
मामका: पाण्डवाश्चैव किमकुर्वत सञ्जय ॥ १ ॥
Dhṛtarāṣṭra said: O Sañjaya, after my sons and the sons of Pāṇḍu assembled in the place of pilgrimage at Kurukṣetra, desiring to fight, what did they do?
-BG 1.1