On the Wikipedia page about Laurent Schwartz, one can find the following quote:
What are mathematics helpful for ? Mathematics are helpful for physics. Physics helps us make fridges. Fridges are made to contain spiny lobsters, and spiny lobsters help mathematicians who eat them and have hence better abilities to do mathematics, which are helpful for physics, which helps us make fridges which...
The source of the quote refers to a French webpage that is now dead (I tried to use the Internet Archive with no success). Do you know a reference (the original reference might be in French) for this quote? A book, a conference, a paper, another webpage...