Many requests have been made for the publication of these studies in book form. Much of this material has already appeared as articles in The Way. In the first section, I discuss the distinction between the forms of consecrated life, following a classification which is also taken up by the Secon Vatican Council in its decree Perfectae Caritatis. It is by distinguishing between these different ways of the Spirit, and by seeking to enter more deeply into them, that all who lead that life - whether they be monks or nuns, or religions dedicated to the apostolate of the priestly ministry or of charitable works, or those leading a consecrated life in the midst of the world - will gain a better understanding of their vocation and of their special mission in the Church. The scond study is an attempt to express the profound meaning of the secular vocation proper to those institutes which were approved by Pope Pius XII in 1947, and of which the Motu Proprio Primo Feliciter laid down the essential characteristics. The third section is a discussion of the role of the priest in approved Secular Institutes. This has relevance today, when special questions arise concerning those Institutes whose secular character is less apparent, who live in community and are occupied in their own special works. In the opinion of many who follow the fully secular vocation, those Institutes would do better to revise their statutes or to choose another denomination - for example, that of Apostolic Institute or Society.