In this article, Étienne Gilson analyzes the notions of dogmatism and tolerance in the light of the analysis of various contemporary historical facts. He defines dogmatism as the philosophical position that affirms that there are certain propositions that can be considered absolutely necessary. Similarly, he defines tolerance in direct relation to dogmatism: for Gilson, there can only be tolerated where there is dogmatism since one can only tolerate the falsity of a position as long as one is sure that another true position exists. Likewise, Gilson succeeds in showing that there is no necessary link between what is called philosophical dogmatism and political tyranny, just as there is no necessary link between philosophical scepticism and political freedom.