33 To wish the Church to be subject to the civil power in the exercise of her duty is a great folly and a sheer injustice. Whenever this is the case, order is disturbed, for things natural are put above things supernatural; the many benefits which the Church, if free to act, would confer on society are either prevented or at least lessened in number; and a way is prepared for enmities and contentions between the two powers, with how evil result to both the issue of events has taught us only too frequently.
Source: Immortale Dei (Vatican.va)