Matter (n.) exists because God is no deceiver: were the idea of extended things fed to us by anything not extended, God would be cheating us.
Matter (n.) is no more abundant in a vase of gold than in a vase of air; quantity of body depends not on weight or hardness but on extension alone.
Matter (n.) exists, but perhaps not as the senses show it; what surely exists outside me is only what geometry can grasp of corporeal objects.
Matter (n.) in Descartes included a subtle kind that stood in for the field: ingenious twisting tendrils from magnet poles, wrong only because he lacked one concept.
Matter (n.) is one stuff: bodies differ no more than water differs from ice, foam and snow — only the shape and arrangement of particles varies.