A fountain sealed: or, The duty of the sealed to the Spirit, and the worke of the Spirit in sealing : Wherein many things are handled about the Holy Spirit, and grieving of it: as also of assurance and sealing what it is, the priviledges and degrees of it, with the signes to discerne, and meanes to preserve it. Being the substance of divers sermons preached at Grayes Inne. By that reverend divine, Richard Sibbes, D.D. and sometimes preacher to that honourable society.