Words and language elements of other types are important only as symbols which evoke definite complexes of mental images and emotions.
Philosophy is characterized by abstract informal thinking.
The combination of high-level abstract constructs used in philosophy with a low degree of formalization requires great effort by the intuition and makes philosophical language the most difficult type of the four. Philosophy borders with art when it uses artistic images to stimulate the intuition. It borders with theoretical science when it develops conceptual frameworks to be used in construction of formal scientific theories.