On reflecting on all you have said in this thread here, I have come to see that there is an argument to settle this issue once and for all. It goes like this:
1: If there is no way to distinguish true thoughts from false ones, all thoughts become meaningless.
2: Not all thoughts are meaningless.
3: There is a way to distinguish true thoughts from false ones (from 1 and 2.)
4: The only way to distinguish true thoughts from all others is if there is a correspondence between the thought and the reality.
5: There is a correspondence between true thoughts and reality (from 3 and 4.)
6. Nothing immaterial corresponds to reality.
7. Anything not immaterial is material (from the law of the excluded middle.)
Conclusion: True thoughts must be material (from 5, 6 and 7.)
1: If there is no way to distinguish true thoughts from false ones, all thoughts become meaningless.
2: Not all thoughts are meaningless.
3: There is a way to distinguish true thoughts from false ones (from 1 and 2.)
4: The only way to distinguish true thoughts from all others is if there is a correspondence between the thought and the reality.
5: There is a correspondence between true thoughts and reality (from 3 and 4.)
6. Nothing immaterial corresponds to reality.
7. Anything not immaterial is material (from the law of the excluded middle.)
Conclusion: True thoughts must be material (from 5, 6 and 7.)
- So there you have it!