The principle here laid down ought to be carefully remembered by all unmarried Christians in the choice of a husband or wife. I fear it is too often entirely forgotten. Too many seem to think of everything except religion in choosing a partner for life, or to suppose that it will come somehow as a matter of course. Yet when a praying, Bible-reading, God-fearing, Christ-loving, Sabbath-keeping Christian marries a person who takes no interest whatever in serious religion, what can the result be but injury to the Christian, or immense unhappiness? Health is not infectious, but disease is. As a general rule, in such cases, the good go down to the level of the bad, and the bad do not come up to the level of the good. The subject is a delicate one, and I do not care to dwell upon it. But this I say confidently to every unmarried Christian man or woman,--if you love your soul, if you do not want to fall away and backslide, if you do not want to destroy your own peace and comfort for life, resolve never to marry any person who is not a thorough Christian, whatever the resolution may cost you. You had better die than marry an unbeliever. Stand to this resolution, and let no one ever persuade you out of it. Depart from this resolution, and you will find it almost impossible to "come out and be separate." You will find you have tied a mill-stone round your own neck in running the race towards heaven; and, if saved at last, it will be "so as by fire." (1 Cor. iii. 15.) I offer these six general hints to all who wish to follow St. Paul's advice, and to come out from the world and be separate. In giving them, I lay no claim to infallibility; but I believe they deserve consideration and attention. I do not forget that the subject is full of difficulties, and that scores of doubtful cases are continually arising in a Christian's course, in which it is very hard to say what is the path of duty, and how to behave. Perhaps the following bits of advice may be found useful.--In all doubtful cases we should first pray for wisdom and sound judgment. If prayer is worth anything, it must be specially valuable when we desire to do right, but do not see our way.--In all doubtful cases let us often try ourselves by recollecting the eye of God. Should I go to such and such a place, or do such and such a thing, if I really thought God was looking at me?--In all doubtful cases let us never forget the second advent of Christ and the day of judgment. Should I like to be found in such and such company, or employed in such and such ways?--Finally, in all doubtful cases let us find out what the conduct of the holiest and best Christians has been under similar circumstances. If we do not clearly see our own way, we need not be ashamed to follow good examples. I throw out these suggestions for the use of all who are in difficulties about disputable points in the matter of separation from the world. I cannot help thinking that they may help to untie many knots, and solve many