Śrīmad-Bhāgavatam · Text 4.22.49
Who is speaking and story frame
वैन्यस्तु धुर्यो महतां संस्थित्याध्यात्मशिक्षया ।
आप्तकाममिवात्मानं मेन आत्मन्यवस्थित: ॥ ४९ ॥
vainyas tu dhuryo mahatāṁ
saṁsthityādhyātma-śikṣayā
āpta-kāmam ivātmānaṁ
mena ātmany avasthitaḥ
Amongst great personalities, Mahārāja Pṛthu was the chief by virtue of his fixed position in relation to spiritual enlightenment. He remained satisfied as one who has achieved all success in spiritual understanding.
Read Śrīla Prabhupāda's purport on Vedabase.io