What to read after The Progressed Horoscope?

The principal use to which astrology is applied by those who fail to realise its true purpose takes the form of searching for future happenings, so that predictions may be made and the future known, to a greater or lesser extent according to the skill of the practitioner. Now it is quite true.that the future may be foreseen more or less in every nativity, yet while some persons will respond to every vibration (whether good or evil) that affects them from without, others will not so respond, either from lack of sensitiveness, or else through the exercise of a strong will trained to control the sheaths or vehicles of response.