Verse 3.18

Sanskrit text and transliteration:

मनसश्चेन्द्रियाणां चेत्येवमाध्यात्मिकं तपः ।
इह न्याय्यं प्रसिद्धं तु ह्यारादुपकरोति नः ॥ १८ ॥

manasaścendriyāṇāṃ cetyevamādhyātmikaṃ tapaḥ |
iha nyāyyaṃ prasiddhaṃ tu hyārādupakaroti naḥ || 18 ||

English translation of verse 3.18:

Here, subjective concentration, that is concentration of mind and the senses, is appropriate. But (the other kinds of tapas) which are well-known help us, indeed, indirectly.

Notes:

Concentration of mind and the senses is ādhyātmika-tapas. Bhṛgu, who wanted to know Brahman, resorted to tapas in the form of concentration of mind and the senses, since it was the direct means to the attainment of the knowledge of Brahman. The other kinds of tapas like kṛcchra, cāndrāyaṇa, etc., which are the well-known religious observances, are useful to the attainment of the knowledge of Brahman only indirectly.