We add now a second duty of married persons--one that has a very prosaic sound, touching a matter so near the springs of feeling. We say that husband and wife should be reasonable--reasonable that they may be true in fact as well as in purpose. Feeling of itself, even when healthy, is a poor guide, sadly blind without reason. Whether it go with love or indifference, folly carries misery into the home. The proverb is true enough-- "A stone is heavy and the sand weighty, But a fool's wrath is heavier than both;" and we might add, a fool's love is quite as heavy as his wrath. We speak not of the folly, which is a natural misfortune, but that of minds befooling themselves by levity, or dissipation, or idleness. Nothing wears better than good sense, and nothing is more essential to permanent congeniality and usefulness. It is sometimes a stern censor, but only because it wishes to be an honest friend. Let married persons take it for their counsellor and it will settle for them many questions, which inflame self-will and disturb love itself. They need above all others to be reasonable, to look to reason with all its revealed lights as the interpreter of God's will to them, and of their own relation to each other. It is a great thing for them to start in life with reasonable views of the most common-place arrangements of the household. How much disappointment, and bitterness, and sin, come from unreasonable views of expense, and who will undertake to estimate the amount of domestic misery resulting from household extravagance? The dress of many a wife, and the wine account of many a husband has been the ruin of the family. Let every couple start with a fair understanding as to what they can afford to spend, and keep sacredly within the limit. If the world laughs at their simplicity, they can well afford to laugh at the world's folly, and time will be very likely to put the laugh upon the right side. Much might be said of the deplorable influence of the extravagant notions of most young women in preventing thoughtful men from taking the risks of marriage, and we hazard nothing in saying that the worst vices of cities are closely connected with the growth of feminine extravagance. America will lose her birthright and have no trace of the old domestic order, if the folly runs through the land, and most girls are brought up to exact more expense than the average returns of industry and talent can earn. Good sense, that honest counsellor, will save the parties from all controversy about prerogative, will interpret their peculiar jurisdictions duly; teaching the man to take the lead without magisterial assumption, to be the guardian without playing the tyrant; teaching the woman to follow his fortunes without being his slave, and to accept his deference without becoming his imbecile toy; exhibiting both in their likeness and difference, equals and not equals, so that the twain are made one by a due balance of gifts and harmony of contrasts.