Srimad Bhagavad Gita -Ramanujacharya
Chapter-6 Dhyāna Yogaḥ
Communion through Meditation
śrī bhagavān uvāca
One who performs actions without motivation for their rewards such as heaven, etc., with the conviction that it is one’s duty, and sole aim, because they are forms of worship of the Supreme Being who is one’s friend in every way and one’s only goal — such a person is a real Sanyāsin, (a practitioner of Jñāna Yoga), and also a Karma Yogi, (practitioner of Karma Yoga). And not one who is disinclined to perform the enjoined works such as sacrifices, etc., nor one who is devoted to mere knowledge alone [without any practice]..