The statement "language is both systematic and arbitrary," is true.
Arbitrary' means chance, unmotivated, without purpose - and those who consider languages as arbitrary structures are stating that they are the product of chance, guided by no objective, that the availability of words and the structures of any language are completely purposeless. Furthermore, language is considered to be the fundamental instrument for human communities, the essential medium of communication, the accurate and powerful tool of thought, the basis for scientific and technological progress.