"It is not possible for me to bear alone such labours and the burden of such weighty cares as press on me from hour to hour, without one man at my side to help me. I have not a soul to aid me in all my anxieties and toils."

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The effects of heat are subject to constant laws which cannot be discovered without the aid of mathematical analysis. The object of the theory is to demonstrate these laws; it reduces all physical researches on the propagation of heat, to problems of the integral calculus, whose elements are given by experiment. No subject has more extensive relations with the progress of industry and the natural sciences; for the action of heat is always present, it influences the processes of the arts, and occurs in all the phenomena of the universe.

— Joseph Fourier