It is manifestly plain that there are many questions in which _right_ and _wrong_ are not variable, but indissoluble and fixed; while there are questions, on the other hand, where these terms are not fixed, but variable, fluctuating, altering, dependent upon circumstances. As, for instance, those in which the apostle teaches in the present chapter the several duties and advantages of marriage and celibacy. There may be circumstances in which it is the duty of a Christian man to be married, there are others in which it may be his duty to remain unmarried. For instance, in the case of a missionary it may be right to be married rather than unmarried; on the other hand, in the case of a pauper, not having the wherewithal to bring up and maintain a family, it may be proper to remain unmarried. You will observe however, that no fixed law can be laid down upon this subject. We cannot say marriage is a Christian duty, nor celibacy is a Christian duty; nor that it is in every case the duty of a missionary to be married, or of a pauper to be unmarried. All these things must vary according to circumstances, and the duty must be stated not universally, but with reference to those circumstances. These therefore, are questions of casuistry, which depend upon the particular _case_: from which word the term "casuistry" is derived. On these points the apostle speaks not by commandment, but by permission; not as speaking by God's command, but as having the Spirit of God. A distinction has sometimes been drawn with reference to this chapter between that which the apostle speaks by inspiration, and what he speaks as a man uninspired. The distinction, however, is an altogether false one, and beside the question. For the real distinction is not between inspired and uninspired, but between a _decision_ in matters of Christian duty, and _advice_ in matters of Christian prudence. It is abundantly evident that God cannot give advice; He can only issue a command. God cannot say, "It is better to do this;" His perfections demand something absolute: "Thou shalt _do_ this; thou shalt _not_ do this." Whensoever therefore, we come to advice there is introduced the human element rather than the divine. In all such cases therefore, as are dependent upon circumstances the apostle speaks not as inspired, but as uninspired; as one whose judgment we have no right to find fault with or to cavil at, who lays down what is a matter of Christian prudence, and not a bounden and universal duty. The matter of the present discourse will take in various verses in this chapter--from the tenth to the twenty-fourth verse--leaving part of the commencement and the conclusion for our consideration, if God permit, next Sunday.