For a marriage to be happy, it must be not be built on the principle of trying-it-out. Crowns are placed upon the heads of those being married in the Church, and these crowns symbolize martyrdom. Martyrdom, because someone decides to live for the other, transcending his egotism, and abandoning a life lived only for himself. And not just for a day, or for two years, but for your whole life. This is a real martyrdom and podvig, when a person rises to the full measure of his human dignity.