The principles of the doctrine of Christ, or, A catechism [electronic resource] : in which is contained the sum of the Christian religion, or what is necessary to be believed and done in order to salvation, the answers being but seventeen in number, and in very plain words easie to be understood : unto which is added A catechism for conscience, wherein the consciences of the ignorant, the grosly profane, the young, the meerely mortal, and the hypocrites are examined in order to their instruction and awakening, and the consciences of the sincere Christians are tried in order to their peace and comfort / by Nathanael Vincent.