The booklet opens with a statement of four cardinal rules to which all disciples must attend:
1. Before the eyes can see they must be incapable of tears.
2. Before the ear can hear it must have lost its sensitiveness.
3. Before the voice can speak in the presence of the Masters, it must have lost its power to wound.
4. Before the soul can stand in the presence of the Masters, its feet must be washed in the blood of the heart.
The author provides essays to explain the meaning of each of these four rules. There is also a short dissertation on 'Karma'.
The main 'Light' consists of two sets, each of twenty-one rules, for the guidance of the 'disciple'. Some of the rules are stated baldly, and some are amplified by the author's comments.