"Absolute space, in its own nature, without relation to anything external, remains always similar and immovable."
Isaac Newton
"Newton himself was better aware of the weaknesses inherent in his intellectual edifice than the generations which followed him. This fact has always roused my admiration."
Albert Einstein
"Only the genius of Riemann, solitary and uncomprehended, had already won its way by the middle of the last century (19th) to a new conception of space, in which space was deprived of its rigidity, and in which its power to take part in physical events was recognized as possible."
Albert Einstein
