The sin against the Holy Ghost: or, The sin unto death briefly discours'd of I. Proving what this sin is. And, II. That all other sins, how great and heinous soever, may be forgiven unto men; but the blasphemy against the Holy Ghost shall never be forgiven, neither in this world, nor in the world to come. To which is added, some instructions how a man may walk and not commit this unpardonable sin. By Mr. Robert Russel.