Make your mind one-pointed in meditation, and your heart will be purified. . . . With all fears dissolved in the peace of the Self and all desires dedicated to Brahman, controlling the mind and fixing it on me (God), sit in meditation with me as your only goal. With senses and mind constantly controlled through meditation, united with the Self within, an aspirant attains nirvana, the state of abiding joy and peace in me.
Source: The Bhagavad-Gita: 6:12-15, pp. 105-106
Contributed by: Zaady