Pope Francis has been quoted in a soon-to-be published book as saying that having gays in the clergy “is something that worries me” and remarking that some societies are considering homosexuality a “fashionable” lifestyle.

Italian daily Corriere della Sera’s website Saturday ran excerpts of the book in the form of an interview that Francis gave about religious vocations. Francis was quoted as describing homosexuality within the walls of seminaries, convents and other religious places where clergy live as “a very serious question.”

“In our societies, it even seems homosexuality is fashionable. And this mentality, in some way, also influences the life of the church,” Francis was quoted as telling his interviewer, a Spanish-born missionary priest, Fernando Prado.

The book, based on four hours of conversations the two had in August at the Vatican, will be published in 10 languages next week. Its Spanish title is “La Fuerza de la vocacion,” (“The Strength of Vocation”).