An answer, in the form of a familiar letter, to two important questions viz. Whether blindness of mind is the primary cause of all the wickedness that there is in the hearts, and lives of men. And, Whether the work of regeneration is wrought in the souls of men, by the supernatural influences of the Holy Spirit, operating with the Gospel; whereby they are inlightened, and enabled to know, and love the truth as it is in Jesus. : In which, some new doctrines which have been lately published, are particularly considered and refuted