A. A. van Ruler is one of the most influential twentieth-century theologians from the Netherlands. One of the many challenging aspects of his work is his theology of the kingdom of God and its relationship to the church and its ecclesiastical offices. Allan J. Janssen draws on extensive pastoral and ecclesial experience as well as closely reasoned analysis to draw out the implications of van Ruler's theology for the church today.

The Testing of Vocation is a comprehensive study that will provide an essential reference volume for historians and all students of the vocation and ministry in today’s Church. It explores in detail the Church of England’s concept of vocation and how it has developed over the century in response to changes in society and in the church.