According to the Bhagavad Gita, what is my duty?

[A question from an internet discussion forum brought to Swami by Śrī Anil.]

Swami replied: The duty of any soul is to please God by its practical behaviour in the world. The soul must develop a liking for what God likes and develop a dislike for what God dislikes. God likes justice and dislikes injustice in worldly life. In spiritual life, however, the soul must vote for God under all circumstances, even if God stands against justice. Pravṛtti or worldly life is the field involving human beings alone. Nivṛtti or spiritual life is the field in which God incarnates among human beings. One should never mix one’s worldly life with one’s spiritual life and get confused. Both duties are equally important.