Beauty is convulsive, or not at all.
Verified
creativitybeautyartfeelingSource: Nadja, André Breton, 1928
The closing line of Nadja (1928): 'La beauté sera CONVULSIVE ou ne sera pas.' Primary source is secure. The English here is a compressed rendering — the literal sense is 'Beauty will be CONVULSIVE or it will not be [at all]'; the corpus may want the standard translation wording.