A helpe to the willing soul, or, The communicants counsellor : being a plaine and familiar discourse upon sundry maine truths, both doctrinall and practicall, requisite to be known, understood and observed by every Christian before his approach to the Lords table : composed mostly in reference to the rules and directions concerning sacramentall knowledge laid down in an ordinance of both Houses of Parliament of the 20 of October, 1645 /