Perfect duty means satisfying the Supreme Lord through your capacity and talents, regardless of material station.Listen — Srila Prabhupada Uvaca
Śrīmad-Bhāgavatam 1.2.12–14 Jagannātha Deities Installation — March 26, 1967, San Francisco 670326SB-SAN FRANCISCO [43:25 Minutes] Prabhupāda: ...[indistinct] they are called śruti. Śruti means the subject matter which is... [break] Without devotion, simply we go on hearing for millions of years, oh, that will not also not act. [aside:] It is here. Bhaktyā śruta-gṛhītayā [SB 1.2.12]. [The seriously inquisitive student or sage, well equipped with knowledge and detachment, realizes that Absolute Truth by rendering devotional service in terms of what he has heard from the Vedānta-śruti.] This is the process of understanding absolute knowledge. Please note these points, what are the process. First thing is that one must be faithful.
Second thing is that he must be thoughtful. The third thing is that he must have knowledge. What is that knowledge? "I am not this body." And then detachment.
As soon as I am convinced that I am not this body, then why should I take so much care for the body? Let me take care of my self. And as soon as these qualifications are fulfilled, then you can see within yourself what you are. Paśyanty ātmānaṁ cātmani [SB 1.2.12].
And all these things is on the basis of devotional service and by the process of hearing from the authoritative source. These are the qualification for understanding Absolute Truth. Now, ataḥ pumbhir dvija-śreṣṭhā varṇāśrama-vibhāgaśaḥ svanuṣṭhitasya dharmasya saṁsiddhir hari-toṣaṇam [SB 1.2.13] [O best among the twice-born, it is therefore concluded that the highest perfection one can achieve by discharging the duties prescribed for one's own occupation according to caste divisions and orders of life is to please the Personality of Godhead.] Now, it is clearly stated here that what is that Absolute Truth. Because as soon as you understand Absolute Truth, then there must be a process of activity, the process of activity. Just like we do sometimes business.
First of all we understand each other and make an agreement. Then there will be business procedure. And then, next stage is profit. Any way you take it... Suppose a boy and a girl agrees to get themselves married.
So that is called agreement: "Yes, I shall marry you. You shall become my husband," "You shall become my wife." That is agreement. Then they should live together as a husband and wife. And the result is that they get good child, very nice child, lovely child.
So everything, first there is to establish relationship. The next work is to act on that relationship. And the result—then enjoy. So similarly, if we understand what is Absolute Truth... The Absolute Truth is already mentioned, that "We understand the Absolute Truth in three phases: first of all, impersonal Brahman; second, localized Paramātmā, Supersoul; and the ultimate, last, is the Supreme Personality of Godhead." So if you at all understand that "Supreme Personality, Godhead, is the cause of all causes.