“There is only one man to follow me who has genius, and that is Edward German.”

Source: Walden

As quoted in “Der Führer als Redner,” Adolf Hitler. Bilder aus dem Leben des Führers" (The Fuhrer as a speaker) by Joseph Goebbels
Other remarks

1850s, Latter-Day Pamphlets (1850), Stump Orator (May 1, 1850)
Context: If the young aspirant is not rich enough for Parliament, and is deterred by the basilisks or otherwise from entering on Law or Church, and cannot altogether reduce his human intellect to the beaverish condition, or satisfy himself with the prospect of making money,—what becomes of him in such case, which is naturally the case of very many, and ever of more? In such case there remains but one outlet for him, and notably enough that too is a talking one: the outlet of Literature, of trying to write Books. Since, owing to preliminary basilisks, want of cash, or superiority to cash, he cannot mount aloft by eloquent talking, let him try it by dexterous eloquent writing. Here happily, having three fingers, and capital to buy a quire of paper, he can try it to all lengths and in spite of all mortals: in this career there is happily no public impediment that can turn him back; nothing but private starvation—which is itself a finis or kind of goal—can pretend to hinder a British man from prosecuting Literature to the very utmost, and wringing the final secret from her: "A talent is in thee; No talent is in thee." To the British subject who fancies genius may be lodged in him, this liberty remains; and truly it is, if well computed, almost the only one he has.

Three Times Three (1936)

Source: The Unbearable Lightness of Being

Einen Menschen verstehen heißt also: auch er sein. Der geniale Mensch aber offenbarte sich an jenen Beispielen eben als der Mensch, welcher ungleich mehr Wesen versteht als der mittelmäßige. Goethe soll von sich gesagt haben, es gebe kein Laster und kein Verbrechen, zu dem er nicht die Anlage in sich verspürt, das er nicht in irgend einem Zeitpunkte seines Lebens vollauf verstanden habe. Der geniale Mensch ist also komplizierter, zusammengesetzter, reicher; und ein Mensch ist um so genialer zu nennen, je mehr Menschen er in sich vereinigt, und zwar, wie hinzugefügt werden muß, je lebendiger, mit je größerer Intensität er die anderen Menschen in sich hat.
Source: Sex and Character (1903), p. 106.

"Of Experiment and of the Genius of Discoveries," p. 37
An Examination of the Philosophy of Francis Bacon (1836)