Srimad Bhagavatam Canto 04, Chapter 24, Text 69

SB 4.24.69

idam japata bhadram vo
 visuddha nrpa-nandanah
sva-dharmam anutisthanto
 bhagavaty arpitasayah
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
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 by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
The prayers offered by Lord Siva 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 brahmana, ksatriya, vaisya, sudra, 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 Krsna maha-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 Krsna maha-mantra also says, “My dear Lord Krsna, my dear Lord Rama, 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 apratihata: “Devotional service cannot be checked by any material condition.” (Bhag. 1.2.6) Lord Caitanya Mahaprabhu also recommended this process:
 
jñane prayasam udapasya namanta eva
 jivanti san-mukharitam bhavadiya-vartam
sthane sthitah sruti-gatam tanu-van-manobhir
 ye prayaso ’jita jito ’py asi tais tri-lokyam
 
(Bhag. 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 Krsna 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 Krsna in order to go back home, back to Godhead.
Srimad Bhagavatam Canto 04, Chapter 24, Text 68
Srimad Bhagavatam Canto 04, Chapter 24, Text 70