+I. The vices condemned.+--1. _Impurity._ Fornication is sometimes
used in Scripture to comprehend the grosser forms of uncleanness, as
incest, adultery, and prostitution; but in common speech it is
appropriated to intimacy between unmarried persons. If acts of
uncleanness are criminal, so are impure thoughts and desires. The
Gospel forbids filthy communication, which indicates a vicious
disposition and corrupts others. Christians must abstain from
everything that tends to suggest wanton ideas, to excite impure
desire, and to strengthen the power of temptation.