All true ministers of the Gospel, are called into that work by the special influences of the Holy Spirit : A discourse shewing the nature and necesity of an internal call to preach the everlasting Gospel. Also marks by which Christ's ministers may be known from others, and answers to sundry objections: together with some observations on the principles and practices of many in the present day concerning these things. : To which is added, some short account of the experiences and dying testimony of Mr. Nathanael Shepherd. /