Every one, therefore, must make use of elements and foundations of this sort, according to the precept, “Enlighten yourselves with the light of knowledge,” if he would desire to form a connected series and body of truths agreeably to the reason of all these things, that by clear and necessary statements he may ascertain the truth regarding each individual topic, and form, as we have said, one body of doctrine, by means of illustrations and arguments,—either those which he has discovered in holy Scripture, or which he has deduced by closely tracing out the consequences and following a correct method.