Srimad-Bhagavatam: Canto 11 - Chapter 1 - Verse 38

Sanskrit:

योगिनोऽपक्व‍योगस्य युञ्जत: काय उत्थितै: ।उपसर्गैर्विहन्येत तत्रायं विहितो विधि: ॥ ३८ ॥

ITRANS:

yogino ’pakva-yogasyayuñjataḥ kāya utthitaiḥupasargair vihanyetatatrāyaṁ vihito vidhiḥ

Translation:

The physical body of the endeavoring yogī who is not yet mature in his practice may sometimes be overcome by various disturbances. Therefore the following process is recommended.

Purport:

Having described the process of cultivating knowledge, the Lord now gives instructions to the yogī whose body may be disturbed by disease or other impediments. Those inferior yogīs who are attached to the body and bodily exercises are often incomplete in their realization, and thus the Lord here offers them some assistance.