42
Śrīmad-Bhāgavatam
[Canto 7, Ch. 11]
ṛta.  Collecting without begging is called  amṛta , begging grains is called  mṛta , tilling the ground is called  pramṛta , and trade is called  satyānṛta . Engaging in the service of low-grade persons, however, is called  śva-vṛtti , the profession of the dogs. Specifically,  brāhmaṇas  and  kṣatriyas  should not engage in the low and abominable service of  śūdras .  Brāhmaṇas  should be well acquainted with all the Vedic knowledge, and  kṣatriyas  should be well acquainted with the worship of demigods.
PURPORT
As stated in  Bhagavad-gītā  (4.13),  cātur-varṇyam mayā sṛṣṭam guṇa-karma-vibhāgaśaḥ : the four divisions of human society were created by the Supreme Lord according to the three modes of material nature and the work ascribed to them. Formerly, the principle of dividing human society into four sections— brāhmaṇa ,  kṣatriya ,  vaiśya  and  śūdra —was strictly followed, but because of gradual neglect of the  varṇāśrama  principles,  varṇa-saṅkara  population developed, and the entire institution has now been lost. In this age of Kali, practically everyone is a  śūdra  ( kalau śūdra-sambhavāḥ ), and finding anyone who is a  brāhmaṇa ,  kṣatriya  or  vaiśya  is very difficult. Although the  Kṛṣṇa  consciousness movement is a movement of  brāhmaṇas  and  Vaiṣṇavas , it is trying to re-establish the divine  varṇāśrama  institution, for without this division of society there cannot be peace and prosperity anywhere.
TEXT 21
शमो दमस्तपः शौचं संतोषः क्षान्तिरार्जवम् । ज्ञानं दयाव्युतात्मत्वं सत्यं च ब्रह्मलक्षणम् ॥२१॥
śamo damas tapaḥ śaucam santoṣaḥ kṣāntir ārjavam jñānam dayācyutātmatvam satyam ca brahma-lakṣaṇam
śamaḥ—control of the mind; damaḥ—control of the senses; tapaḥ—austerity and penance; śaucam—cleanliness; santoṣaḥ—satisfaction;