Isha Upanishad 55

55

avidyayā karmaṇā agnihotrādinā mṛtyuṃ svābhāvikaṃ karma jñānaṃ ca mṛtyuśabdavācyamubhayaṃ tīrtvā atikramya vidyayā devatājñānenāmṛtaṃ devatātmabhāvamaśnute prāpnoti /
taddhyamṛtamucyate yaddevatātmagamanam //

Since this is so, therefore vidyā and avidyā, i.e. meditation on deities and rites; yaḥ tad veda ubhayaṁ saha, he who knows these together, knows them as things to be performed by the same person; for that man alone, who thus combines (the two), there occurs the successive acquisition of the two goals in the same individual. This is being said:

Avidyayā, through avidyā, through rites such as Agnihotra; mṛtyum, death—rites and meditation induced by one's nature;footnote{"The impression (created on the mind) by merit, demerit, etc., acquired in a previous birth, as manifested at the time of death, is called nature."—Śaṅkara's commentary on the Gītā, XVII. 2.} tīrtvā, crossing over—over both these which are called death; vidyayā, through vidyā, the meditation on the deities; (one) aśnute, attains; amṛtam, immortality, identification with the deities; that very fact of becoming one with the gods being called immortality.

Avidyayā, through avidyā, through rites such as Agnihotra; mṛtyum, death—rites and meditation induced by one's nature;footnote{"The impression (created on the mind) by merit, demerit, etc., acquired in a previous birth, as manifested at the time of death, is called nature."—Śaṅkara's commentary on the Gītā, XVII. 2.} tīrtvā, crossing over—over both these which are called death; vidyayā, through vidyā, the meditation on the deities; (one) aśnute, attains; amṛtam, immortality, identification with the deities; that very fact of becoming one with the gods being called immortality.