But genius is nothing more nor less than childhood recovered at will — a childhood now equipped for self-expression with manhood’s capacities and a power of analysis which enables it to order the mass of raw material which it has involuntarily accumulated.
 
[Le génie n’est que l’enfance retrouvée à volonté, l’enfance douée maintenant, pour s’exprimer, d’organes virils et de l’esprit analytique qui lui permet d’ordonner la somme de matériaux involontairement amassée.]

Charles Baudelaire (1821-1867) French poet, essayist, art critic

“Le Peintre de la Vie Moderne [The Painter of Modern Life],” sec. 3 (1863) [tr. Mayne (1964)]
    (Source)

(Source (French)). Alternate translations:

But genius is simply childhood recovered at will, a childhood now equipped for self-expression, with mature faculties and an analytic spirit which permit him to set in order the mass of raw material he has involuntarily accumulated.
[tr. Kline (2020)]

Genius is only childhood recovered at will, childhood now gifted to express itself with the faculties of manhood and with the analytic mind that allows him to give order to the heap of unwittingly hoarded material.
[Source]

But genius is no more than childhood recaptured at will, childhood equipped now with man’s physical means to express itself, and with the analytical mind that enables it to bring order into the sum of experience, involuntarily amassed.
[Source]