J. S. Mill's Underestimated Immaterialism

You can find quotes from J. S. Mill here:
phenomenalism....
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phenomenalism....
J. S. Mill
immaterialism
perspectivism
neutral monism
Ernst Mach
Wittgenstein
"Matter, then, may be defined, a Permanent Possibility of Sensation. If I am asked, whether I believe in matter, I ask whether the questioner accepts this definition of it. If he does, I believe in matter: and so do all Berkeleians. In any other sense than this, I do not. But I affirm with confidence, that this conception of Matter includes the whole meaning attached to it by the common world, apart from philosophical, and sometimes from theological, theories. The reliance of mankind on the real existence of visible and tangible objects, means reliance on the reality and permanence of Possibilities of visual and tactual sensations, when no such sensations are actually experienced."