Happiness is constitutionally dissatisfying. Sense pleasure, for example, pleasure of good company gives happiness. But the happiness it gives has many problems. It's strictly limited. You don't get that kind of a shopping euphorian from black friday purchases.
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.