Srimad-Bhagavatam: Canto 12 - Chapter 1 - Verse 9
Sanskrit:
एवमात्मानमात्मस्थमात्मनैवामृश प्रभो ।बुद्ध्यानुमानगर्भिण्या वासुदेवानुचिन्तया ॥ ९ ॥
ITRANS:
evam ātmānam ātma-sthamātmanaivāmṛśa prabhobuddhyānumāna-garbhiṇyāvāsudevānucintayā
Translation:
My dear King, by constantly meditating upon the Supreme Lord, Vāsudeva, and by applying clear and logical intelligence, you should carefully consider your true self and how it is situated within the material body.