This is our position. Anything... If you are walking on the street, if you kill an ant by walking, you will be punished. This is nature's law. We are in such a dangerous position. In every movement there is punishment. Now, if you believe the śāstras, that is different thing. If you don't believe, then do anything you like. But from śāstra we can understand the laws of nature, or God, is very, very strict, very, very strict. So Maṇḍūka Muni also chastised Yamarāja, that "In my childhood, without any knowledge I did something and for which you have given me so great punishment. So you are not fit for becoming a brāhmaṇa or kṣatriya. You become śūdra." So he was cursed to become śūdra. Therefore Yamarāja took his birth as Vidura and was born in the womb of a śūdra mother. This is the history of Vidura's birth.
So in his absence, Aryamā, one of the demigods, he officiated Yamarāja. Therefore it is said, abibhrad aryamā daṇḍam. The office must go on, the magistrate post cannot be vacant. Somebody must come and act. So Aryamā was acting. Yathāvad agha-kāriṣu. Agha-kāriṣu. Agha-kāri means... Agha means sinful activities, and kāriṣu. Kāriṣu means those who commit sinful acts. And yathāvat. Yathāvat means exactly to the point, how he should be punished. Yathāvad agha-kāriṣu. Yāvad dadhāra śūdratvam. So long Yamarāja continued as a śūdra, Aryamā was officiating in his place as Yamarāja. This is the purport. (reads purport:) "Vidura, born in the womb of a śūdra mother, was forbidden even to be a party of royal heritage along with his brothers Dhṛtarāṣṭra and Pāṇḍu. Then how could he occupy the post of a preacher to instruct such learned...? Answer is that even though it is accepted that he was a śūdra by birth, because he renounced the world for spiritual enlightenment by the authority of Ṛṣi Maitreya and was thoroughly educated by him in transcendental knowledge, he was quite competent to occupy the post of an ācārya or spiritual preceptor." Vidura was a śūdra, born śūdra. Then how he became a preacher?