A companion to the altar: shewing the nature and necessity of a sacramental preparation, in order to our worthy receiving the Holy Communion. [electronic resource] : Wherein those fears and scruples about eating and drinking unworthily, and of incurring our own damnation thereby, are proved groundless and unwarrantable. Unto which are added, prayers and meditations, preparative to a sacramental preparation, according to what the Church of England requires from her communicants.