SB 7.11.21

śamo damas tapaḥ śaucaṁ
 santoṣaḥ kṣāntir ārjavam
jñānaṁ dayācyutātmatvaṁ
 satyaṁ ca brahma-lakṣaṇam

Synonyms: 

śamaḥ — control of the mind; damaḥ — control of the senses; tapaḥ — austerity and penance; śaucam — cleanliness; santoṣaḥ — satisfaction; kṣāntiḥ — forgiveness (being unagitated by anger); ārjavam — simplicity; jñānam — knowledge; dayā — mercy; acyuta-ātmatvam — accepting oneself as an eternal servant of the Lord; satyam — truthfulness; ca — also; brahma-lakṣaṇam — the symptoms of a brāhmaṇa.

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.