Before that, however, in 1824, he had accepted an invitation to visit Abraham Mendelssohn Bartholdy in Berlin to give some lessons to his children Felix and Fanny. His comments on meeting them were: "This is a family the like of which I have never known. Felix, a boy of fifteen is a phenomenon. What are all prodigies compared with him? ... He is already a mature artist. His elder sister Fanny is also extraordinarily gifted." Shortly afterwards he wrote: "This afternoon ... I gave Felix Mendelssohn his first lesson, without losing sight for a moment of the fact that I was sitting next to a master, not a pupil."