2. For consider, in the next place, what must in all cases be the consequence of allowing evil thoughts to be present to us, though we do not actually admit them into our hearts. This, namely,--we shall make ourselves familiar with them. Now our great security against sin lies in being shocked at it. Eve gazed and reflected when she should have fled. It is sometimes said "Second thoughts are best:" this is true in many cases, but there are times when it is very false, and when, on the contrary, first thoughts are best. For sin is like the serpent, which seduced our first parents. We know that some serpents have the power of what is called "fascinating." Their eye has the power of subduing--nay, in a strange way, of alluring--their victim, who is reduced to utter helplessness, cannot flee away, nay, rather is obliged to approach, and (as it were) deliver himself up to them; till in their own time they seize and devour him. What a dreadful figure this is of the power of sin and the devil over our hearts! At first our conscience tells us, in a plain straightforward way, what is right and what is wrong; but when we trifle with this warning, our reason becomes perverted, and comes in aid of our wishes, and deceives us to our ruin. Then we begin to find, that there are arguments available in behalf of bad deeds, and we listen to these till we come to think them true; and then, if perchance better thoughts return, and we make some feeble effort to get at the truth really and sincerely, we find our minds by that time so bewildered that we do not know right from wrong. Thus, for instance, every one is shocked at cursing and swearing when he first hears it; and at first he cannot help even showing that he is shocked; that is, he looks grave and downcast, and feels uncomfortable. But when he has once got accustomed to such profane talking, and been laughed out of his strictness, and has begun to think it manly, and has been persuaded to join in it, then he soon learns to defend it. He says he means no harm by it; that it does no one any harm; that it is only so many words, and that every body uses them. Here is an instance in which disobedience to what we know to be right makes us blind.