The first of Comenius’ works to be published in the field of teaching was The School of Infancy, in 1630. It was designed as a helper for mothers and nannies to use when instructing children at home. This was followed in 1631 by The Gate of Languages Unlocked, which virtually revolutionized the teaching of Latin. It was arranged with parallel columns of text, one in Czech and one in Latin.
Awake! May 8, 1999 p. 22