This text presents the Blessed Trinity-one God in three divine Persons: Father, Son and Holy Spirit-which is the central mystery of the Christian Faith. We are called to know and love God and to share in his divine life. Following the Nicene Creed and based on Sacred Scripture, the role of each Person of the Blessed Trinity in the plan of salvation and the Christian life examined.
This book, The Blessed Trinity and Our Christian Vocation, corresponds to Book II: Who Is Jesus Christ? in the curriculum framework.

The Didache Semester Series is a series of high school textbooks, teacher's manuals, and student workbooks published by Midwest Theological Forum. Each title spans one academic semester. These titles have been developed according to the 2007 curriculum framework from the USCCB Subcommittee on the Catechism to assist in the publication of religious education textbooks for Catholic high schools.

This textbook is published with ecclesiastical approval from the Archdiocese of Chicago, and it has been granted conformity with the Catechism of the Catholic Church by the USCCB Subcommittee on the Catechism.