The sin of which I speak is peculiarly likely to be that of a thoughtful, reflective, and fastidious person like yourself. It is therefore to you of the utmost importance to acquire, and to acquire at once, complete control over your thoughts,—first, carefully ascertaining which those are that you ought to avoid, and then guarding as carefully against such as if they were the open semblance of positive sin. This is really the only means by which a truthful and candid nature like your own can ever maintain the deportment of Christian love and charity towards those among whom your lot is cast. You must resolutely shut your eyes against all that is unlovely in their character. If you suffer your thoughts to dwell for a moment on such subjects, you will find additional difficulty afterwards in forcing them away from that which is their natural tendency, besides having probably created a feeling against which it will be vain to struggle. It is one of the strongest reasons for the necessity of watchful self-control, that no mind, however powerful, can exercise a direct authority over the feelings of the heart; they are susceptible of indirect influence alone. This much increases the necessity of our watchfulness as to the indirect tendencies of thoughts and words, and our accountability with respect to them. Our anxiety and vigilance ought to be altogether greater than if we could exercise over our feelings that direct and instantaneous control which a strong mind can always assert in the case of words and actions.
Unless the indirect influence of which I have spoken were practicable, the warnings and commands of Scripture would be a mockery of our weakness,—a cruel satire on the helplessness of a victim whose efforts to fulfil duty must, however strenuous, prove unavailing. The child is commanded to honour his parent, the wife to reverence her husband; and you are to observe attentively that there is no exception made for the cases of those whose parents or husbands are undeserving of love and reverence. There must, then, be a power granted, to such as ask and strive to acquire it, of closing the mental eyes resolutely against those features in the character of the persons to whom we are bound by the ties of duty, which would unfit us, if much dwelt upon, for obedience in such important particulars as the love and reverence we are commanded to feel towards them.