Pope Francis: 'Love between a man and a woman ... is not made in a day'

(CNN) "You can't hurry love," the Supremes sang in 1966, and on Wednesday Pope Francis joined in the chorus.

Speaking off the cuff to the many engaged couples gathered in St. Peter's Square for his weekly audience, Francis said that a lifetime love takes time to grow.

"The alliance of love between a man and a woman, an alliance for life, cannot be improvised, and is not made in a day," the Pope said.

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Distinction between the engaged and the married

He also argued implicitly against premarital sex.

"The Church, in her wisdom, maintains the distinction between engaged and married couples -- they are not the same," he said. "Today's culture and society have become rather indifferent to the delicate and serious nature of this passage."

Francis spoke a day after his top deputy, Vatican Secretary of State Cardinal Pietro Parolin, referred to Ireland's vote this week in favor of gay marriage as "a defeat for humanity." There was no indication, however, that the Pope's message to the betrothed referred in any way to the Irish vote.