I do not know. [summarising his life's work]

- Joseph-Louis Lagrange

If I had inherited a fortune I should probably not have cast my lot with mathematics.

- Joseph-Louis Lagrange

The ordinary operations of algebra suffice to resolve problems in the theory of curves.

- Joseph-Louis Lagrange

It has cost them but a moment to cut off that head; but a hundred years will not be sufficient to produce another like it.

- Joseph-Louis Lagrange

Newton was the greatest genius that ever existed, and the most fortunate, for we cannot find more than once a system of the world to establish.

- Joseph-Louis Lagrange

I regarded as quite useless the reading of large treatises of pure analysis: too large a number of methods pass at once before the eyes. It is in the…

- Joseph-Louis Lagrange

As long as algebra and geometry have been separated, their progress have been slow and their uses limited; but when these two sciences have been unit…

- Joseph-Louis Lagrange

The reader will find no figures in this work. The methods which I set forth do not require either constructions or geometrical or mechanical reasonin…

- Joseph-Louis Lagrange

It took the mob only a moment to remove his head; a century will not suffice to reproduce it.

- Joseph-Louis Lagrange