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A mathematical idea "abstract enough to be useless for physics"

Grothendieck (if it is was him) said somewhere :

"

This xxx is XXX, at least, is an idea that will not be used in physics"physics.

Q1 : is ?? Is XXX an n-groupoid, ? a stack? Can you supplies someone supply the precise quote? (, either in French or in Englishit does not matter).?

Q2: Predecessors of this quote in the same vein quotes would also be of interest? . Thank you.

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A mathematical idea abstract enough to be useless for physics

Grothendieck ( if it is him) said somewhere :

"This xxx is at least an idea that will not be used in physics".

Q1 : is ?? an n-groupoid , a stack ? Can you supplies the precise quote ? (in French or in English it does not matter).

Q2: Predecessors in the same vein quotes would be of interest? Thank you.