Closet-prayer a Christian duty: or, A treatise upon Mat. VI, VI. : tending to prove that the worship of God in secret, is the indispensible duty of all Christians; both by sundry examples and arguments. Together, with a severe rebuke of Christians for their neglect of, or negligence in, the duty of closet-prayer: and many directions for the managing thereof, exhortations to it, objections answered, cases of conscience cleared