In plain words
Now, when Hanumān went in search of Sītā, Rāma told Hanumān some marks of Sītā and sent him off. For Hanumān had not seen Sītā before. Then Rāma: ‘She will be wearing a light yellow sari. Her hair will be in two plaits. She will be overflowing with divine splendour of many kinds,’ these were the marks he told him. When he went into Laṅkā and searched, no one with two plaits met his eye there. The reason is that demons always wear their hair loose. They have no single plait. No triveṇī. Among them only one, Sītā alone, was to be seen without her hair let loose like that. But there were not two plaits, as Rāma had said: there was only one. So, taking it that she was not Sītā, he began to search further. That is to say, this had to be taken as an example so that we may recognise the sacredness of the triveṇī.
We Must Make Our Karmas Sacred
Triveṇī means the place where three rivers, the Gaṅgā, the Yamunā and the Sarasvatī, meet; that place is Triveṇī, and that same place received the fitting name of sacred Prayāga. But we must come to know how the special greatness of this Gaṅgā, Yamunā and Sarasvatī is present in this humanity. Our Bhakti itself is the Gaṅgā, karma itself the Yamunā, Jñāna itself the Sarasvatī. The Gaṅgā means this: in a sacred way, we must merge our feelings in the Paramātma. And now the Yamunā: the Yamunā is such that in carrying out its own duty it does not break discipline in the least. Now, this Gaṅgā and Yamunā are nothing but our breathing in and breathing out. This breath on the left side is the Gaṅgā; the breath on the right side is the Yamunā. The left one is itself called Iḍā, and the right one is itself called Piṅgalā. The two, Iḍā and Piṅgalā, come together and are joined with the Sarasvatī, which is called the middle seat of Brahman. In the same way, the Gaṅgā and Yamunā show themselves through the openings, but the one called Suṣumnā we cannot see. In the same way, the Gaṅgā and Yamunā we do see, but the Sarasvatī we cannot see. Yet what we cannot see is the very thing that is the support for seeing. In us, if the two gateways called Iḍā and Piṅgalā have no joining called Suṣumnā, Iḍā and Piṅgalā cannot work.