The spiritualist generations made as many and as vain efforts to deny Matter as the materialist generations have made to deny Spirit.

Why such discussions?
Does not man himself offer irrefragable proof of both systems?
Do we not find in him material things and spiritual things?
None but a madman can refuse to see in the human body a fragment of Matter; your natural sciences, when they decompose it, find little difference between its elements and those of other animals.

On the other hand, the idea produced in man by the comparison of many objects has never seemed to any one to belong to the domain of Matter.

As to this, I offer no opinion.

I am now concerned with your doubts, not with my certainties.