III. The grace which is exhibited in or by the sacra-

ments, rightly used, is not conferred by any power in tlieni ; neither doth th#e efficacy of a sacrament depend upon the piety or intention of him that doth administer it «, but upon the work of the Spirit '', and the wonl of institution ; which contains, together witli a precept authorising the use thereof, a promise of benefit to worthy leceivers '.