It can't be summarized. Go here and read it all. But I can't resist.
"The Church's primary mission of evangelization, in which educational institutions play a crucial role, is consonant with a nation's fundamental aspiration to develop a society truly worthy of the human person's dignity. At times, however, the value of the Church's contribution to the public forum is questioned. It is important therefore to recall that the truths of faith and of reason never contradict one another (cf. First Vatican Ecumenical Council, Dogmatic Constitution on the Catholic Faith Dei Filius, IV: DS 3017; St. Augustine, Contra Academicos, III, 20, 43). The Church's mission, in fact, involves her in humanity's struggle to arrive at truth. In articulating revealed truth she serves all members of society by purifying reason, ensuring that it remains open to the consideration of ultimate truths. Drawing upon divine wisdom, she sheds light on the foundation of human morality and ethics, and reminds all groups in society that it is not praxis that creates truth but truth that should serve as the basis of praxis. Far from undermining the tolerance of legitimate diversity, such a contribution illuminates the very truth which makes consensus attainable, and helps to keep public debate rational, honest and accountable. Similarly the Church never tires of upholding the essential moral categories of right and wrong, without which hope could only wither, giving way to cold pragmatic calculations of utility which render the person little more than a pawn on some ideological chess-board."
Posted by Gibbons