Relativism is Graduate Skepticism

By the word skepticism Father Picard means every doctrine which deems it impossible to attribute a value of absolute necessity to any knowledge. Therefore he considers skeptics, not only those who maintain that one can know nothing, viz., the holders of absolute skepticism, but even the holders of phenomenism: that all is appearance; the holders of relativism: that nothing is absolutely true; the holders of pragmatism: that the principles of knowledge are true insofar as they are comfortable, and we have motives instead of reasons to accept them.

Etienne Gilson, Realisme Thomist et Critique de la Connaissance, Paris: Vrin, 1947, 80-81.

Subjectivism (that I am the measure of reality) is the foundation for skepticism (that there is no reality). Because, if every man is the measure, there is no measure. Fact is, Christ is the measure of man!