A new fundamental science, pure phenomenology, has developed within philosophy: This is a science of a thoroughly new type and endless scope. It is inferior in methodological rigor to none of the modern sciences. All philosophical disciplines are rooted in pure phenomenology, through whose development, and through it alone, they obtain their proper force.

Pure Phenomenology: Its Method and Its Field of Investigation; Inaugural Lecture at Freiburg im Breisgau (May 3, 1917)