Quotes from Srila Prabhupada

atah pumbhir dvija-srestha
varnasrama-vibhagasah
svanusthitasya dharmasya
samsiddhir hari-tosanam
[SB 1.2.13]

You never mind in whatever condition you are. You may be a brahmana. You may be a ksatriya or a sudra or... You have got particular duty. That's all. That makes you a brahmana and a sudra or a brahmacari. But whatever particular duty you may have, just try to see whether by your duty this Supreme Lord is satisfied. Then it is perfect. Svanusthitasya dharmasya samsiddhir hari-tosanam [SB 1.2.13]. That is the test: if you have satisfied Krsna through His representative. Yasya prasadad bhagavat-prasadah. Just like we work in some big establishment, and if we can satisfy our immediate boss, that is the satisfaction of the whole company. You haven't got to see whether all the members of the company have become satisfied. Simply the immediate boss under which you are working, if he is satisfied, then you know the company is satisfied because he will submit the report of his work. Similarly, Krsna is very kind. He is helping you in different ways. He is within your heart. Krsna is within your heart. Antaryami. Caitya-guru. And is presenting Himself as spiritual master both ways, externally, internally. He is trying to help you. And when you are actually taking the advantage of that help, and if you are engaged with love and affection in the transcendental service of the Lord, then you can talk with God from within. God is within you. You haven't got to find out God in so many places. Anywhere you can sit down. But if you are sincere, if you are actually wanting to offer your service to the Lord -- tesam satata-yuktanam bhajatam priti-purvakam, dadami buddhi-yogam tam [Bg. 10.10] -- He will give you intelligence. Simply we have to become sincere servitor.

--- Srila Prabhupada in lecture titled Caste System Cast Out