In plain words
To experience divinity, every man must remove the faults of his Buddhi and become pure
Once, Śaṅkara set out on a journey to win every quarter. On that journey he met Maṇḍanamiśra. This Maṇḍanamiśra was a mighty paṇḍit. A great scholar. Śaṅkara debated with him and tried to defeat him. While Maṇḍanamiśra and Śaṅkara were debating, someone had to be the judge of it. That person had to decide and declare whose was the victory and whose the defeat. Whoever was to decide this victory and defeat had to be one who had attained the mighty Ṛta and Satya. Ordinary people cannot make this decision. The reason is this: on one side, there was Ādi Śaṅkara. On the other side was Maṇḍanamiśra, who bore learning itself as his form. Who could decide victory and defeat in a debate between two such persons? Thinking this over again and again, Śaṅkara spoke. ‘Maṇḍanamiśra! For our two arguments, your wife in Dharma, Ubhayabhāratī, is the judge,’ he said. Do you see! How much inner meaning there is in this: the husband debating with ascetics and yogis like Śaṅkara, and his wife set as judge! Śaṅkara spoke. ‘There can be no greater judge than Ubhayabhāratī, a virtuous woman who knows Ṛta, a jewel among virtuous women who walks the path of Satya. Ubhayabhāratī has the power and the ability to decide victory and defeat in our two arguments,’ he said. Their debate took place. ‘Whoever loses in this debate must take up sannyāsa, give up the householder's life and live in the forest’: that was the rule here. Śaṅkara had no family; the family there was belonged to Maṇḍanamiśra alone! So Ubhayabhāratī sat down. The debate went on. Night and day, giving up even food and sleep, they debated. Usually enmity grows between those who argue. That is why one should not argue about worldly matters. Those who argue make their enmity grow. But this was a debate between scholars, so there was no hatred here. Both were very great scholars, divine lights.