A brāhmaṇa, it is the duty of the brāhmaṇa to see that his son is being properly trained up as a brāhmaṇa. Satyaṁ śamo damas titikṣā ārjavaṁ brahma-karma svabhāva-jam (BG 18.42). Everything is there. The brāhmaṇas should be taught how to become truthful, first of all. A brāhmaṇa will never speak lie, at any cost. It is stated that even if his enemy inquires something confidential from him, he'll say, "Yes, this is my position." This is truthfulness. He'll not even, I mean to say, guile, against his enemy. He should be truthful. Even kṣatriyas, they are also truthful men. Truthfulness is so valuable. That makes one powerful brāhmaṇa. Satyam.
There is an instance how a brāhmaṇa is recognized. Satyakam yavala(?). Upaniṣads. This satyakam went to Gautama Muni. "Sir, please make me your disciple." So according to Vedic principle, without becoming a brāhmaṇa he cannot be accepted as disciple. Without becoming brāhmaṇa. In our Society also, we do not accept a disciple unless he's brahminically qualified: no meat-eating, no illicit sex, no gambling, no intoxication. These are brahminical. Unless one is free from the sinful activities, how he can become a brāhmaṇa? Brāhmaṇa means śuci. And the others, they are called kṛpaṇa, or muci. Śuci means always cleansed. Internally... Bāhyābhyantara-śuciḥ. Inside and outside. Outside by taking bath, washing with soda, soap, or if soda, soap is not available, with earth or oil. That is external cleanliness. Similarly, internal cleanliness, one must rise early in the morning, evacuate, then after taking bath must chant Hare Kṛṣṇa mantra, see the maṅgala-ārātrika. In this way one has to purify himself internally and externally. God consciousness is not so cheap thing. Yeṣāṁ tv anta-gataṁ pāpaṁ janānāṁ puṇya-karmaṇām. One who is completely free from all contamination of material modes, anta-gataṁ pāpam, sinful activities, they can te dvandva-moha-nirmuktā bhajante mām (BG 7.28), they can stick to the principle of devotional service. Otherwise, if he's not free from the contamination of sinful life, he may show, make a show of devotion, but that is not actual devotion. Bhaktyābhāsa. That is called bhaktyābhāsa.
So these things should be observed. Brāhmaṇa, a brāhmaṇa's duty is to present himself an ideal human being. Satyaṁ śamo damas titikṣā. Titikṣā means toleration. "Oh, it is very cold. No, I cannot take bath." No. You must tolerate. You must tolerate. Titikṣā. Ārjavam, simplicity; jñānam, full knowledge; vijñānam, practical application. Jñānaṁ vijñānam āstikyam. Āstikyam means completely convinced of God and his relationship with God. That is called āstikyam. Or full faith in the statement of the Vedas. Whatever Veda says, that's right. Yes. No argument. That is called āstikyam. No argument.