I came across this quote while reading an article on the Boundless webzine.
It was written by Susanna Wesley to her son while he was away at college. Apparently he had written to ask her for a list of sins he should avoid while away (?!). I can only presume this was to allow himself a human conscience (that might forget something) rather than invoking divine guidance that would doubtless be more thorough.
She did well though. Instead of making a list of vices she made a list of descriptions. I thought this was great:
Whatever weakens your reason, whatever impairs the tenderness of your conscience, whatever obscures your sense of God, whatever increases the authority of your body over your mind, whatever takes away from your relish for spiritual things, that to you is sin, no matter how innocent it is in itself.