""The Practical Efficacy of the Unitarian Doctrine: Considered in a Series of Letters to Andrew Fuller"" is a book written by Joshua Toulmin and published in 1801. The book is a collection of letters that Toulmin wrote to Andrew Fuller, a prominent Baptist theologian, in response to Fuller's criticisms of Unitarianism. Toulmin defends the Unitarian doctrine and argues that it is not only intellectually sound but also has practical benefits for individuals...