Those who want worldly things and other worldly things, you perform these rituals with desire, sanscrit word is sakama. Those who do not want these things, they want only god, realization, self knowledge, enlightenment. And it's a long lifetime after lifetime. No, you already are that perfect reality. That's what velanta will teach us.
Swami Sarvapriyananda teaches the Katha Upanishad, which is one of the most popular Upanishads. The scripture concerns the story of a young man who goes to the house of death to find out what happens after death. The reply describes the nature of reality and the meaning of life.