That tree - did it fall if no-one saw it? Depends whether you're asking from a theoretical view of the world, or from direct conscious experience!
What is good about feeling the pain of grief? It tells us who we really are.
Does sound travel from an object to the self which hears it? Is that our experience - or our theory? Does it matter?
I am sitting here. Is that statement true? Your answer will be useless, unless...
Is it a "thing" only because we think it is? Is thing-ness a thought? Then what is reality?
Insight is meditation doing itself! Can this be true?
If it's only a thought that there is an "I", are we nothing but a causal process?
Has thinking got you in an arm-lock? Break free, check The Four Noble Truths of Thinking... [click on the title above]
We don't choose what thoughts to have, yet we claim whatever thought comes as mine? Crazy! Not mine? Crazier!
Every time you meditate, you miss this chance for liberating insight!