Gradus Ad Parnassum

The Latin phrase Gradus ad Parnassum means "A Step to Parnassus". It is sometimes shortened to Gradus. The name Parnassus was used to denote the loftiest part of a mountain range in central Greece, a few miles north of Delphi, of which the two summits, in Classical times, were called Tithorea and Lycoreia. In Greek mythology, one of the peaks was sacred to Apollo and the nine Muses, the inspiring deities of the arts, and the other to Bacchus. The phrase has often been used to refer to various books of instruction, or guides, in which gradual progress in literature, language instruction, music, or the arts in general, is sought.