In a letter to "every particular family in every part of the world" for the 1994 United Nations International Year of the Family, Pope John Paul II says that it is through the family the "primary current of the civilization of love" passes, finding in the family "its social foundations." The Pope calls the family "the great mystery of God," commenting, however, that "modern rationalism does not tolerate mystery." In the Pope's presentation the family is placed at the center of the great struggle between good and evil, between life and death, between love and all that is opposed to love. To the family is entrusted the task of striving to "unleash the forces of good." In it are discussed the family as the domestic church; the equal dignity of man and woman; the responsibilities of men for the children they father; the value of the work mothers do; the worth and dignity of children; the rights of families; family life as a vocation; responsible parenthood;' the indissolubility of marriage; solidarity among families in providing religious education; prayer in family life; the challenges of child-rearing; and other points. "While certainly showing understanding for the many complex crisis situations in which families are involved, as well as for the moral frailty of every human being, the Church is convinced that she must remain absolutely faithful to the truth about human love."