"The chief defect of all hitherto existing materialism - that of Feuerbach included - is that the thing, reality, sensuousness, is conceived only in the form of the object or of contemplation, but not as human sensuous activity, practice, not subjectively."
Marx, First Thesis on Feuerbach
"Materialism will be seen as a senile idealism to the extent that it is
not immediately based on psychological or social facts, instead of on
artificially isolated physical phenomenon."
Georges Bataille "Materialism" in Visions of Excess