 Thus the Observations was the focus of sustained study and high esteem—if you followed Priestley, the most important book, after the Bible. The poet Samuel Taylor Coleridge, converted to Priestleian Unitarianism at Cambridge, had his portrait painted holding a copy of the Observations (see Paley 1999, 18–23), and named his first son David Hartley Coleridge. Other writers offer similar testimonies. Few works discussed in this encyclopedia have been the objects of such deep personal involvement.