|Canto 11: General History||Chapter 18: Description of Varṇāśrama-dharma|
Bhaktivedanta VedaBase: Śrīmad Bhāgavatam 11.18.4
grīṣme tapyeta pañcāgnīn
varṣāsv āsāra-ṣāḍ jale
evaḿ vṛttas tapaś caret
grīṣme — in the summer; tapyeta — one should accept as austerity; pañca-agnīn — five fires (the overhead sun and fires burning on four sides); varṣāsu — during the rainy season; āsāra — torrents of rain; ṣāṭ — tolerating; jale — in water; ā-kaṇṭha — up to the neck; magnaḥ — submerged; śiśire — in the coldest part of winter; evam — thus; vṛttaḥ — engaged; tapaḥ — penance; caret — one should execute.
Thus engaged as a vānaprastha, one should execute penance during the hottest summer days by subjecting oneself to burning fires on four sides and the blazing sun overhead; during the rainy season one should remain outside, subjecting oneself to torrents of rain; and in the freezing winter one should remain submerged in water up to one's neck.
One who engages in sense gratification must perform severe penances at the end of life to counteract his sinful, hedonistic activities. A devotee of the Lord, however, naturally develops Kṛṣṇa consciousness and need not subject himself to such radical penances. As stated in the Pañcarātra,
ārādhito yadi haris tapasā tataḥ kiḿ
nārādhito yadi haris tapasā tataḥ kim
antar bahir yadi haris tapasā tataḥ kiḿ
nāntar bahir yadi haris tapasā tataḥ kim
"If one is worshiping the Lord properly, what is the use of severe penances? And if one is not properly worshiping the Lord, what is the use of severe penances? If Śrī Kṛṣṇa is realized within and without everything that exists, what is the use of severe penances? And if Śrī Kṛṣṇa is not seen within and without everything, then what is the use of severe penances?"
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Founder Ācārya of the International Society for Krishna Consciousness
His Holiness Hrdayananda dasa Goswami
Gopiparanadhana dasa Adhikari
Dravida dasa Brahmacari