[...] I bring you a fresh recommendation, as much in the interests of the person I am recommending as in those of the Leipzig Opera. When there is a musical conductor's post vacant beside Seidl, may I ask you very urgently to appoint to the post Herr Mottl of Vienna, an extraordinarily talented young man? He is the last whom I can recommend—I know of no others. His capacity and skill are quite unusual and I have come to know them very accurately by experience. I should be really glad to know that your opera was conducted by two such particularly excellent, active and, in their way, amiably efficient musicians. [...]
Source: Letters of Richard Wagner, Vol. 2, selected and ed. Wilhelm Altmann, trans. M. M. Bozman (J. M. Dent & Sons, 1927), No. 717