The author of ''Secret of the Ages,'' Robert Collier, during an active and successful life developed the basic ideas which opened up new vistas of living for countless multitudes of people. Brought up to be a priest, he worked as a mining engineer, an advertising executive and a prolific writer and publisher. His family carries on his quest to help people open up their minds to the potential within themselves and thereby to achieve wealth, success, health and happiness out of life.