How can Priests advise as to the duties of the married state when they have no practical experience of it?

The Catholic Answers

“The lips of the Priest shall keep knowledge, and they shall seek the law at his mouth.” Mai. II., 7. The married state is not exempt from God’s laws, and the Priests must know those laws. Every Priest studies all the possible duties of marriage from a moral point of view during a long course of theology before he enters a Confessional at all. If you say that a Priest cannot explain those laws to people because he himself is not married, will you say that a trained lawyer has no right to explain the law of the land to a plumber concerning that individual’s trade because he himself has never so much as soldered a jam-tin?

Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty