97 What We have taught about the reconstruction and perfection of social order can surely in no wise be brought to realization without reform of morality, the very record of history clearly shows. For there was a social order once which, although indeed not perfect or in all respects ideal, nevertheless, met in a certain measure the requirements of right reason, considering the conditions and needs of the time. If that order has long since perished, that surely did not happen because the order could not have accommodated itself to changed conditions and needs by development and by a certain expansion, but rather because men, hardened by too much love of self, refused to open the order to the increasing masses as they should have done, or because, deceived by allurements of a false freedom and other errors, they became impatient of every authority and sought to reject every form of control.
Source: Quadragesimo Anno (Vatican.va)