The good work begun in the day of grace performed untill the day of Christ : With the addition of a cautionary letter, sent unto some youths, by an unknown authour. Unto which is subjoyned a return of thanks to the authour of the letter: with further cautionary motives, and directions, unto youths professing religion, to keep them from apostacy, and backsliding. By Thomas Vincent, minister sometime of Maudlins Milk-street, London.