Srimad Bhagavad Gita -Ramanujacharya
Chapter-6 Dhyāna Yogaḥ
yaṃ saṃnyāsam-iti prāhur-yogaṃ taṃ viddhi pāṇḍava |
The term Sanyāsa refers here to Karma Yoga only, which also includes Jñāna Yoga or knowledge of the true nature of Self. One who has not attained the level of realisation that the body is different than the Self, cannot become a Karma Yogi of the type described here.