115 To the proximate preparation of a good married life belongs very specially the care in choosing a partner; on that depends a great deal whether the forthcoming marriage will be happy or not, since one may be to the other either a great help in leading a Christian life, or, a great danger and hindrance. And so that they may not deplore for the rest of their lives the sorrows arising from an indiscreet marriage, those about to enter into wedlock should carefully deliberate in choosing the person with whom henceforward they must live continually: they should, in so deliberating, keep before their minds the thought first of God and of the true religion of Christ, then of themselves, of their partner, of the children to come, as also of human and civil society, for which wedlock is a fountain head. Let them diligently pray for divine help, so that they make their choice in accordance with Christian prudence, not indeed led by the blind and unrestrained impulse of lust, nor by any desire of riches or other base influence, but by a true and noble love and by a sincere affection for the future partner; and then let them strive in their married life for those ends for which the State was constituted by God. Lastly, let them not omit to ask the prudent advice of their parents with regard to the partner, and let them regard this advice in no light manner, in order that by their mature knowledge and experience of human affairs, they may guard against a disastrous choice, and, on the threshold of matrimony, may receive more abundantly the divine blessing of the fourth commandment: "Honor thy father and thy mother (which is the first commandment with a promise) that it may be well with thee and thou mayest be long-lived upon the earth."
Source: Casti Connubii (Vatican.va)