I have just attended a rehearsal of Lohengrin! The incredibly moving effect upon me of this first hearing I cannot lock away among my loveliest and clearest of experiences, artistic and human, without sharing it at once with you. I waited for this through twelve years of my life—and what years!! You were right to desire this joy for me so often! But it could never have been offered me so fully anywhere but here! Ah! if only you were to be present to-morrow!! [...]
Source: Letters of Richard Wagner, Vol. 2, selected and ed. Wilhelm Altmann, trans. M. M. Bozman (J. M. Dent & Sons, 1927), No. 489