Brahmagupta quotes:

A person who can, within a year, solve x2 - 92y2 = 1 is a mathematician.

As the sun eclipses the stars by its brilliancy, so the man of knowledge will eclipse the fame of others in assemblies of the people if he proposes algebraic problems, and still more if he solves them.

Bodies fall towards the earth as it is in the nature of the earth to attract bodies, just as it is in the nature of water to flow.