Yoga  as Work in Devotion
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very tired if he works all the time, but if one works in Krṣṇa consciousness, he can chant Hare Krṣṇa and engage in devotional service twenty-four hours a day and never get tired. But if we vibrate some mundane vibration, then we soon become exhausted. There is no question of becoming tired on the spiritual platform. The spiritual platform is absolute. In the material world everyone is working for sense gratification. The profits of one's labor in the material world are used to gratify one's senses. But a real  yogī  does not desire such fruits. He has no desire other than Krṣṇa, and Krṣṇa is already there.