The greatness of sin improv'd by the penitent as an argument with God for a pardon. A sermon at the Thursday lecture in Boston, October 17th. 1734. Preach'd in the hearing of John Ormesby, and Matthew Cushing, two condemned malefactors on the day of their execution, the one for murder, and the other for burglary. / By John Webb, A.M. Pastor of a church in Boston. ; With an appendix, giving a faithful account of the behaviour of Matthew Cushing, after his condemnation, and at the time of his execution. By the Reverend Mr. Cooper.