SRIMAD-BHAGAVATAM 7 CHAPTER 15 TEXT 66
yad yasya vāniṣiddhaṁ syād
yena yatra yato nṛpa
sa teneheta kāryāṇi
naro nānyair anāpadi
TRANSLATION
In normal conditions, in the absence of danger, O King Yudhiṣṭhira, a man should perform his prescribed activities according to his status of life with the things, endeavors, process and living place that are not forbidden for him, and not by any other means.
PURPORT
This instructionis given for men in all statuses of life. Generally society is divided into brāhmaṇas, kṣatriyas, vaiśyas, śūdras, brahmacārīs, vānaprasthas, sannyāsīs and gṛhasthas. Everyone must act according to his position and try to please the Supreme Personality of Godhead, for that will make one’s life successful. This was instructed in Naimiṣāraṇya:
ataḥ pumbhir dvija-śreṣṭhā
varṇāśrama-vibhāgaśaḥ
svanuṣṭhitasya dharmasya
saṁsiddhir hari-toṣaṇam
“O best among the twice-born, it is therefore concluded that the highest perfection one can achieve, by discharging his prescribed duties [dharma] according to caste divisions and order of life, is to please the Lord Hari.” (Bhāg. 1.2.13) Everyone should act according to his occupational duties just to please the Supreme Personality of Godhead. Then everyone will be happy.