Mahabharata 3.181.28
मनुष्यास्तप्ततपसः सर्वागमपरायणाःस्थिरव्रताः सत्यपरा गुरुशुश्रूषणे रताः
manuṣyāstaptatapasaḥ sarvāgamaparāyaṇāḥsthiravratāḥ satyaparā guruśuśrūṣaṇe ratāḥ
Our plain-language meaning of this verse is waiting for scholar review.
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