In plain words
Thinking that worldly, bodily love itself is permanent, you play and sing with the body and fancy that this itself is joy. That is never joy. That itself will never be permanent. Divine Prema alone is permanent. Recognising this Satya, Naciketas gave up everything. Without any desires, he kept his mind steady. All these worldly loves are bound to waste away! The only Prema that never wastes away is divine Prema. Long for that divine Prema; worship it. You will remain in Ānanda forever. Physical love is born and dies. But divine Prema is not something that is born, not something that dies. Divine Prema itself is Satya. Whatever changes, it does not change. Worship that changeless Satya; adore it. That is true Mokṣa. What is Mokṣa? Mokṣa is the very end of moha. We must give up this moha for the body. The moment we give it up, perfect Vairāgya comes to us. So, if we want Mokṣa, the principle of Prema is the chief thing.
Ubhayabhāratī's teaching of Jñāna
Once, on his tour of victory, Ādi Śaṅkara took up a debate with a scholar named Maṇḍanamiśra. Their rule was that the one who lost should become the disciple of the one who won. Maṇḍanamiśra's wife was Ubhayabhāratī. She was rich in every kind of knowledge. So they made her the judge and held the debate. Ubhayabhāratī gave her verdict that her husband had lost. Keeping the vow he had made, Maṇḍanamiśra took sannyāsa and became Śaṅkara's disciple. Ubhayabhāratī too took sannyāsa, built herself an āśrama near the Gaṅgā and went on teaching Jñāna to women.
Every day, at the very break of dawn, she would go with her women disciples to the Gaṅgā, bathe and come back. On the path they took, a sannyāsi lived under a tree. People called him ‘Brahmajñāni’. One day, afraid that someone might steal the gourd he used for drinking water, he lay down with it under his head. ‘He is a great jñāni,’ said a woman disciple. ‘His is only physical knowledge, not divine Jñāna.