Medieval philosophical texts came in a variety of literary forms. Allegory is a medieval literary form where the story uses symbols and metaphors to show a profound moral or spiritual meaning. Aphorism is a brief and often humorous statement of truth or opinion. Axiom is an accepted principle or rule. Commentary is when a writer comments on, or explains the content of another written work, such as a sacred text. Dialogue is when characters hold conversations about serious topics. Soliloquy is where a character talks to himself. Meditation is used as a religious practice of contemplating spiritual subjects. Many of the writers were risking a reprimand from political and religious authorities so they tried to protect themselves from persecution by writing in a complex, almost cryptic-like manner. The allegories and commentaries served to conceal their true meaning from the people.