E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Needs must when the Devil Drives.
The French say: Il faut marcher quand le diable est aux trousses; and the Italians say: Bisogna andare, quando il diavolo è vella coda. If I must, I must.
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He must needs go that the Devil drives. Shakespeare: Alls Well That-Ends Well, i. 3.