The unpardonable sin : Or, The sin against the Holy Ghost discovered. Shewing, I. What the sin against the Holy Ghost is. II. How any person may assuredly know whether he is, or has been guilty of this great sin. III. Some motives to perswade sinners speedily to repent, and turn to god; and not to despair of his mercies toward them. With encouragements to sincere tho' doubting Christians, to walk on chearfully in their Chirstian course, till they arrive to eternal happiness. By William Smith, M.A.