Srimad Bhagavatam Canto 11, Chapter 18, Text 44

SB 11.18.44

iti mam yah sva-dharmena
 bhajen nityam ananya-bhak
sarva-bhutesu mad-bhavo
 mad-bhaktim vindate drdham
 
Translation: 
 
One who worships Me by his prescribed duty, having no other object of worship, and who remains conscious of Me as present in all living entities, achieves unflinching devotional service unto Me.
 
Purport: 
 
It is clearly explained in this verse that loving devotional service unto Lord Krsna is the ultimate goal of the entire varnasrama system, which the Lord has been elaborately explaining. In any social or occupational division of human society one must be a devotee of the Supreme Personality of Godhead and worship Him alone. The bona fide spiritual master is the representative of Lord Krsna, and worship of the acarya goes directly to the lotus feet of the Lord. Although ordinary householders are sometimes ordered by Vedic injunctions to worship particular demigods or forefathers, one should remember that Lord Krsna is within all living entities. As stated here, sarva-bhutesu mad-bhavah. The pure devotees of the Lord worship the Lord alone, and those who cannot come to the standard of pure devotional service should at least meditate upon the Personality of Godhead within the demigods and all other living entities, understanding that all religious processes are ultimately meant for the pleasure of the Lord. In the course of missionary work even pure devotees must deal with government leaders and other prominent members of society, sometimes praising such persons and complying with their orders. Yet because the devotees are always meditating on Lord Krsna situated as the Supersoul within everyone, they are therefore acting for the Lord’s pleasure and not for the pleasure of any ordinary human being. Those persons dealing with different demigods in the course of their varnasrama duties should similarly see the Lord as the basis of everything. They should concentrate on pleasing the Supreme Lord by all activities. This stage of life is called love of God, and it brings one to the point of actual liberation.
Srimad Bhagavatam Canto 11, Chapter 18, Text 43
Srimad Bhagavatam Canto 11, Chapter 18, Text 45