Letters on Theron and Aspasio

Robert Sandeman's Letters on Theron and Aspasio is a collection of epistolary writings published in the 1750s that articulate his controversial views on faith and justification.

In these letters Sandeman critiques prevailing Calvinist emphases, arguing that faith primarily consists in intellectual assent to the truths about Christ rather than a trusting reliance that involves imputation of Christ's righteousness.

His positions sparked controversy, contributed to the naming of the Sandemanian movement, and influenced later debates about the nature of saving faith.

The work was widely read and discussed in Britain and North America in the 18th and 19th centuries, and remains a primary source for understanding Sandemanian theology.

It has been cited historically as provoking responses from mainstream Reformed and evangelical theologians who defended a more robust account of fiducia (trust) in faith.