11 As for the ecclesiastical property which we are accused of having abandoned, it is important to remark that this property was partly the patrimony of the poor and the patrimony, more sacred still, of the dead. It was not permissible to the Church to abandon or surrender it; she could only let it be taken from her by violence. Nobody will believe that she has deliberately abandoned, except under the pressure of the most overwhelming motives, what was confided to her keeping, and what was so necessary for the exercise of worship, for the maintenance of sacred edifices, for the instruction of her clergy, and for the support of her ministers. It was only when perfidiously placed in the position of having to choose between material ruin and consent to the violation of her constitution, which is of divine origin, that the Church refused, at the cost of poverty, to allow the work of God to be touched by her. Her property, then, has been wrested from her; it was not she that abandoned it. Consequently, to declare ecclesiastical property unclaimed on a given date unless the Church had by then created within herself a new organism; to subject this creation to conditions in rank opposition to the divine constitution of the Church, which was thus compelled to reject them; to transfer this property to third parties as if it had become "sans maitre," and finally to assert that in thus acting there was no spoliation of the Church but only a disposal of the property abandoned by her - this is not merely argument of transparent sophistry but adding insult to the most cruel spoliation. This spoliation is undeniable in spite of vain attempts at palliating it by declaring that no moral person existed to whom the property might be handed over; for the state has power to confer civil personality on whomsoever the public good demands that it should be granted to, establishments that are Catholic as well as others. In any case it would have been easy for the state not to have subjected the formation of associations cultuelles to conditions in direct opposition to the divine constitution of the Church which they were supposed to serve.
Source: Une Fois Encore (Vatican.va)