Srimad-Bhagavatam: Canto 7 - Chapter 1 - Verse 21

Sanskrit:

शमो दमस्तप: शौचं सन्तोष: क्षान्तिरार्जवम् ।ज्ञानं दयाच्युतात्मत्वं सत्यं च ब्रह्मलक्षणम् ॥ २१ ॥

ITRANS:

śamo damas tapaḥ śaucaṁsantoṣaḥ kṣāntir ārjavamjñānaṁ dayācyutātmatvaṁsatyaṁ ca brahma-lakṣaṇam

Translation:

The symptoms of a brāhmaṇa are control of the mind, control of the senses, austerity and penance, cleanliness, satisfaction, forgiveness, simplicity, knowledge, mercy, truthfulness, and complete surrender to the Supreme Personality of Godhead.

Purport:

In the institution of varṇāśrama-dharma, the symptoms of a brāhmaṇa, kṣatriya, vaiśya, śūdra, brahmacārī, gṛhastha, vānaprastha, and sannyāsī are all described. The ultimate aim is acyutātmatvam — to think always of the Supreme Personality of Godhead, Kṛṣṇa, or Viṣṇu. To make advancement in Kṛṣṇa consciousness, one has to become a brāhmaṇa, with the above-mentioned symptoms.