In the Bhagavad Gita, Krishna scolds Arjuna to stand up and fight. He says no spirituality is possible without that faith in oneself. If you want to become enlightened then you have to get up and do your duty. Nothing will work for us until we make up our minds to change - this must come from 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.