it is the title of a some classic literature, could you gloss the title itself and maybe give some comment of the meaning of the literature itself.
揚子 is simply the author's name (originally 揚雄, 子 being a respectful address form analogous to 孔子/孔丘, Confucius).
法言: 言 means speech or word or writings. 法 is a central concept of Confucianism. According to 《爾雅·釋詁》: 法，常也。 It derives from classical ceremonial practices and pertains to social norms and moral philosophy (a bit similar to the Hindu concept of dharma, which is translated as 法 in Chinese). The work itself is thus a disputation on Confucian philosophy.