For it wrote letters to Elpidio (1835-1836), nonconventional educative work species, directed to Cuban youth, to which it described like " the sweet hope of patria". One of the most important works of production began the vareliana it to publish in its newyorkino exile, in 1835, with the Letter name to Elpidio. According to the original plan of the work, it would consist of three volumes. First, published in the mentioned year, it tried on the impiedad; the second, published three years later, talked about the superstition, and the third party, that did not get to publish itself, would deal with the fanaticism. From the times in which it appeared the work many were interrogated on whom he would be the adressee of Letters. Some thought that they were directed to Light; but the fact that it was written assiduously with this one and that Light made an extensive commentary of the work, it denies this idea. The most acceptable thesis is in question one of a personage created by the imagination of Varela, like a symbol that reflected to Cuban youth.
Etymological, Elpidio means and, in the Varela, hope beginnings the work write, talking about to youth: " Deals that they are the sweet hope of patria". Three years ago, Varela came maintaining strong controversies with the North American protestant theologians. In those controversies the differences between the catholic moral and the protestant became evident. Paralelamente, received letters of Havana in which the existing difficult situation in the Island was expressed. From this interaction the Letter idea arose to Elpidio. It wrote letters to Eusebio, against the ties more precovers that were against to a change in the moral: the impiedad and the superstition, although desire to write one against the fanaticism, could not never make specific it. The more important pedagogical work of the philosophical production of Varela, because essentially it served basic for the lessons as that matter in Cuba and other countries as Hispano-America until 1842, is its Lessons of Philosophy.