In modern times, this concept has been opposed by totalitarianism, which, in its Marxist-Leninist form, maintains that some people, by virtue of a deeper knowledge of the laws of the development of society, or through membership of a particular class or through contact with the deeper sources of the collective consciousness, are exempt from error and can therefore arrogate to themselves the exercise of absolute power. It must be added that totalitarianism arises out of a denial of truth in the objective sense. If there is no transcendent truth, in obedience to which man achieves his full identity, then there is no sure principle for guaranteeing just relations between people. Their self-interest as a class, group or nation would inevitably set them in opposition to one another. If one does not acknowledge transcendent truth, then the force of power takes over, and each person tends to make full use of the means at his disposal in order to impose his own interests or his own opinion, with no regard for the rights of others. (Papal Encyclical, Centesimus Annus, 1 May 1991).