Bhagavad Gita -Swami Sivananda
Dhritarashtra and Pandu were brothers. Dhritarashtra married Gandhari, and Pandu was married to Kunti and Madri. King Pandu was cursed for a sin while hunting, due to which he was not permitted to unite with his wife. Kunti got a boon through her sincere service of a wise sage in her younger age, and she begot three children, namely, Yudhisthira, Bhima and Arjuna from Yama, Vayu and Indra respectively. Madri had twins, Nakula and Sahadeva, through the celestial physicians called Asvini-Devatas. Dhritarashtra had a hundred and one children by his wife Gandhari. Pandu passed away and his sons, the Pandavas, were all brought up by Dhritarashtra along with his sons known as Kauravas. The Pandavas and Kauravas grew up together, but due to the braveness and intelligence of the former, the Kauravas were unable to tolerate them. Hence the Pandavas decided to live separately, sharing half of their kingdom.
The Pandavas’ pomp, wealth and glory displayed during the Rajasuya Yajna aroused deep jealousy and greed in the mind of Duryodhana, the chief of the Kauravas, who, with the cunning advice of his uncle, Sakuni, invited Yudhisthira to a game of dice and fraudulently defeated him, whereby all his wealth and possessions, including Draupadi, were lost. Finally it was settled that the Pandavas, including Draupadi, should repair to the forest for twelve years in exile, after which they had to live incognito for another year, untraced by the Kauravas. During this period the kingdom was to be ruled by the wicked Duryodhana.
Having successfully completed these thirteen years of exile, facing many obstacles and dangers instigated by the Kauravas, the Pandavas, as per the terms of the agreement, approached the Kauravas for their share of the kingdom. Duryodhana, however, flatly refused to part with as much land as could be covered by the point of a needle. According to the advice of Mother Kunti and with the inspiration of Lord Krishna, the Pandavas decided upon war and tried to establish their rightful claim on the kingdom by overcoming the Kauravas.