“Since the religious revolution of the sixteenth century, to no man has the Catholic Church in Scotland been so much indebted as to Bishop Hay. He is pre-eminently her bishop of the last three hundred years.”

- Bishop John Strain, Archbishop of the Metropolitan see of St. Andrews and Edinburgh, 1810–1883  

In this succinct text, Bishop Hay provides a field map to knowing your enemies, and learning how to defeat them.