SB 4.24.69

idaṁ japata bhadraṁ vo
 viśuddhā nṛpa-nandanāḥ
sva-dharmam anutiṣṭhanto
 bhagavaty arpitāśayāḥ
Word for word: 
idam — this; japata — while chanting; bhadram — all auspiciousness; vaḥ — all of you; viśuddhāḥ — purified; nṛpa-nandanāḥ — the sons of the King; sva-dharmam — one’s occupational duties; anutiṣṭhantaḥ — executing; bhagavati — unto the Supreme Personality of Godhead; arpita — given up; āśayāḥ — possessing all kinds of faithfulness.
Translation: 
My dear sons of the King, just execute your occupational duty as kings with a pure heart. Just chant this prayer fixing your mind on the lotus feet of the Lord. That will bring you all good fortune, for the Lord will be very much pleased with you.
Purport: 

The prayers offered by Lord Śiva are very authoritative and significant. Simply by offering prayers to the Supreme Lord one can become perfect, even though engaged in his occupational duty. The real purpose of life is to become a devotee of the Lord. It does not matter where one is situated. Whether one is a brāhmaṇa, kṣatriya, vaiśya, śūdra, American, Englishman, Indian, etc., one can execute devotional service anywhere and everywhere in the material existence simply by offering prayers unto the Supreme Personality of Godhead. The Hare Kṛṣṇa mahā-mantra is also a prayer, for a prayer addresses the Supreme Personality of Godhead by His name and invokes good fortune by petitioning the Lord to allow one to engage in His devotional service. The Hare Kṛṣṇa mahā-mantra also says, “My dear Lord Kṛṣṇa, my dear Lord Rāma, O energy of the Lord, Hare, kindly engage me in Your service.” Although one may be situated in a lowly position, he can execute devotional service under any circumstance, as stated, ahaituky apratihatā: “Devotional service cannot be checked by any material condition.” (Bhāg. 1.2.6) Lord Caitanya Mahāprabhu also recommended this process:

jñāne prayāsam udapāsya namanta eva
 jīvanti san-mukharitāṁ bhavadīya-vārtām
sthāne sthitāḥ śruti-gatāṁ tanu-vāṅ-manobhir
 ye prāyaśo ’jita jito ’py asi tais tri-lokyām

(Bhāg. 10.14.3)

One may remain situated in his own place or in his own occupational duty and still lend his ear to receive the message of the Lord from realized souls. The Kṛṣṇa conscious movement is based on this principle, and we are opening centers all over the world to give everyone a chance to hear the message of Lord Kṛṣṇa in order to go back home, back to Godhead.