Genius and talent are nearly always connected in the popular idea, as if the first were a higher, or the highest, grade of the latter, and as if a man of very high and varied talents might be a sort of intermediate between the two. This view is entirely erroneous. Even if there were different degrees or grades of genius, they would have absolutely nothing to do with so-called “talent.” A talent, for instance the mathematical talent, may be possessed by someone in a very high degree from birth; and he will be able to master the most difficult problems of that science with ease; but for this he will require no genius, which is the same as originality, individuality, and a condition of general productiveness. On the other hand, there are men of great genius who have shown no special talent in any marked degree; for instance, men like Novalis or Jean Paul. Genius is distinctly not the superlative of talent; there is a world-wide difference between the two; they are of absolutely unlike nature; they can neither be measured by one another or compared to each other. Talent is hereditary; it may be the common possession of a whole family (e.g. the Bach family); genius is not transmitted; it is never diffused, but is strictly individual.
Otto Weininger, Sex & Character