51Thomas Jefferson to John Wayles Eppes, 24 January 1817 (Jefferson Papers)
Francis arrived here in good health the day before Yesterday. I think he cannot do better than to take this occasion of learning Spanish, because it is a language rarely taught in this country, and will be of great importance within his day. it is that too in which all the early history of America is written. I suppose he may acquire so much of it in 2. or 3. months as to pursue it easily...