1. First, _Our reason is directly perverted when it is so far wrought upon as to call that good, which is indeed plainly and apparently evil_. So great a corruption is not common and ordinary, neither can the heart of man be easily drawn to go so palpably against clear light and evidence. It is therefore only in some cases and in some persons, either of weaker faculties or of extraordinary debauched principles, that Satan can work up lust to give so great a darkness. However, it is evident that Satan useth these deceits in this thing. (1.) First, He strives, where the matter will bear it, _to put the name of virtue or good upon actions and things that are not so_. This temptation doth most appear in those things that are of a doubtful and disputable nature, or in those actions which in their appearance or pretensions may seem to be virtuous. Whatever sin is capable of any paint or varnish, that he takes the advantage of. Saul’s sacrificing was a great iniquity, and yet the pretence of the general goodness of the action, being in itself commanded, and the supposed necessity of Saul’s doing it, because Samuel came not, were considerations upon which his understanding warranted to him that undertaking. Paul’s persecution, though a real gratification of his envious lustings, by his blinded understanding was judged duty. What more common than for worldly-mindedness and covetousness to be called a faithful and dutiful care for the provision of our families! Lukewarmness is often justified under the notion of moderation and prudence; and anything that can but pretend any kindred to or resemblance of good, our lusts presently prevail for an approbation and vindication of it. (2.) Secondly, Satan useth _the advantage of extremes for the corrupting of our understandings_. To this purpose he doth all he can to make such an extreme odious and displeasing, that so we may run upon the contrary as matter of duty. Many there are whose heads are so weak, that if they see the danger of one extreme, they never think themselves in safety till they fly to a contrary excess, and then they think the extreme they embrace needs no other justification than the apparent evil of what they have avoided. Satan knowing this, like the lapwing, makes the greatest noise when he is furthest from his nest, and in much seeming earnestness tempts us to something that is most cross to our temper or present inclination; or endeavours to render something so to us, not with any hopes to prevail with us there, but to make us run as far from it as we can into another snare, and also to make us believe that we have done well and avoided a temptation, when indeed we have but exchanged it.