This essay focuses on a surprisingly underexplored manuscript of the London puritan woodturner, Nehemiah Wallington. His ‘Coppies of profitable and comfortable letters’ anthologizes printed correspondence of martyrs and Reformed clergy alongside Wallington's own pious exchanges with ministers, neighbours and friends. Since Wallington's agonies of doubt about his religious estate are well known to early modern historians, his piety provides a particularly valuable lens through which to explore how clergymen and laypeople attempted to address the pastoral obstacle of religious uncertainty. This remarkable manuscript provides insights into clerical status within puritan spirituality, shedding light on the role of Protestant ministers as physicians of the soul, who conceived of themselves as indispensable experts in the diagnosis and cure of the spiritual afflictions of their lay devotees. Wallington and others, seeking resolutions for their doubts and scruples, affirmed the particular authority of these clergy as pastoral specialists. This essay presents evidence of sustained clericalism within Protestant piety, a tendency which acted in tension with a concurrent trend of spiritual individualism. Furthermore, it advances an argument for the significant role which epistolary counselling played in Protestant pastoral ministry to those afflicted by religious doubt.