“The critical ontology of ourselves has to be considered not, certainly, as a theory, a doctrine, nor even as a permanent body of knowledge that is accumulating; it has to be conceived as an attitude, an ethos, a philosophical life in which the critique of what we are is at one and the same time the historical analysis of the limits that are imposed on us and an experiment with the possibility of going beyond them.”

“The problem of religion and the problem of orthodox Christianity are not one and the same thing. Much that we see around us today of unbelief and criticism, and the negation of our so-called truths, is based upon the fact that religion has been largely superseded by creed, and doctrine has taken the place of living experience. It is this living experience which is the keynote of this book.”

“The philosopher will ask himself … if the criticism we are now suggesting is not the philosophy which presses to the limit that criticism of false gods which Christianity has introduced into our history.”

“The Marxist critique is only a critique of capital, a critique coming from the heart of the middle and petit bourgeois classes, for which Marxism has served for a century as a latent ideology…. The Marxist seeks a good use of economy. Marxism is therefore only a limited petit bourgeois critique, one more step in the banalization of life toward the "good use" of the social!”

“I believe in limited government. I believe that government should be limited in many ways, and what I am going to emphasize is only an intellectual thing. I don't want to talk about everything at the same time. Let's take a small piece, an intellectual thing.No government has the right to decide on the truth of scientific principles, nor to prescribe in any way the character of the questions investigated. Neither may a government determine the aesthetic value of artistic creations, nor limit the forms of literary or artistic expression. Nor should it pronounce on the validity of economic, historic, religious, or philosophical doctrines. Instead it has a duty to its citizens to maintain the freedom, to let those citizens contribute to the further adventure and the development of the human race.”

“The only limitations are those which we impose upon ourselves.”

“From the fact that a man or a community of men lacks the intellectual wherewithal or cultural and philosophical framework to conceive of property rights—it doesn't follow that he has no such rights, or that he has forfeited them. Not if one adheres to the ancient doctrine of natural rights.”

“Philosophy's position with regard to science, which at one time could be designated with the name "theory of knowledge," has been undermined by the movement of philosophical thought itself. Philosophy was dislodged from this position by philosophy.”

“We don't have enough knowledge until we learn to know. But the limitations of humanity prevent us from knowing what is unknown and what is beyond reasoning. That is why we cannot rely entirely on ourselves.”

“There is a kinship of all beings, for the life process has sprung from one source and evolved according to one fundamental principle. Consciousness of kind, therefore, the ability to participate in the psychic states of others, is cultivated by a knowledge of the nature and content of those around us, and anything which tends to increase or complete our knowledge of others, as identity of language, association, or ambition, tends to intensify consciousness of kind, and whatever limits or prevents knowledge of others tends to cause us to consider them of a different order or kind from ourselves.”