4. Hence even those thoughts which are occasioned by weakness or disease, by the natural mechanism of the body, or by the laws of vital union, however innocent they may be in themselves, do nevertheless become sinful, when they either produce or cherish and increase in us any sinful temper: suppose the desire of the flesh, the desire of the eye, or the pride of life. In like manner the wandering thoughts which are occasioned, by the words or actions of other men, if they cause or feed any wrong disposition, then commence sinful. And the same we may observe of those which are suggested or injected by the devil. When they minister to any earthly or devilish temper (which they do, whenever we give place to them, and thereby make them our own) then they are equally sinful, with the tempers to which they minister. 5. But abstracting from these cases, wandering thoughts, in the latter sense of the word, that is, thoughts wherein our understanding wanders, from the point it has in view, are no more sinful than the motion of the blood in our veins, or of the spirits in our brain. If they arise from an infirm constitution, or from some accidental weakness or distemper, they are as innocent as it is to have a weak constitution, or a distempered body. And surely no one doubts but a bad state of nerves, a fever of any kind, and either a transient or a lasting delirium, may consist with perfect innocence. And if they should arise in a soul which is united to an healthful body, either from the natural union between the body and soul, or from any of ten thousand changes, which may occur in those organs of the body, that minister to thought: in any of these cases they are as perfectly innocent as the causes from which they spring. And so they are when they spring from the casual, involuntary associations of our ideas. 6. If our thoughts wander from the point we had in view, by means of other men, variously affecting our senses, they are equally innocent still: for it is no more a sin, to understand what I see and hear, and in many cases cannot help seeing, hearing, and understanding, than it is to have eyes and ears. “But if the devil injects wandering thoughts, are not those thoughts evil?” They are troublesome, and in that sense evil; but they are not sinful. I do not know that he spoke to our Lord with an audible voice; perhaps he spoke to his heart only, when he said, _All these things will I give thee, if thou wilt fall down and worship me_. But whether he spoke inwardly or outwardly, our Lord doubtless understood what he said. He had therefore a thought correspondent to those words. But was it a sinful thought? We know it was not. _In him was no sin_, either in action, or word, or thought. Nor is there any sin in a thousand thoughts of the same kind, which Satan may inject into any of our Lord’s followers.