In the words of the author:

When a man enters a dark room, he is not sure of his movements; he cannot see objects around him or properly locate them and is liable to hurt himself by coming into sudden contact with them. But let a light be introduced, and immediately all confusion disappears. Every object is seen, and there is no danger of being hurt. To the majority life is such a dark room, and their frequent hurts - their disappointments, perplexities, sorrows, and pains - are caused by sudden contact with principles that they do not see and are therefore not prepared to deal with. But when the light of wisdom is introduced into the darkened understanding, confusion vanishes, difficulties are dissolved, all things are seen in their true place and proportion, and henceforth the man walks open eyed and unhurt, in the clear light of wise comprehension.

Contents:

1. The Light That Leads to Perfect Peace
2. Light on Facts and Hypotheses
3. Light on Cause and Effect in Human Life
4. Light on Values - Spiritual and Material
5. Light on the Sense of Proportion
6. Light on Adherence to Principle
7. Light on the Sacrifice of the Self
8. Light on the Management of the Mind
9. Light on Self-Control
10. Light on Acts and Their Consequences
11. Light on the Way of Wisdom
12. Light on Disposition
13. Light on Individual Liberty
14. Light on the Blessing and Dignity of Work
15. Light on Good Manners and Refinement
16. Light on Diversities of Creeds
17. Light on Law and Miracle
18. Light on War and Peace
19. Light on the Brotherhood of Man
20. Light on Life's Sorrows
21. Light on Life's Changes
22. Light on the Truth of Transitoriness
23. The Light That Never Goes Out