Thoughts vs Knowledge

I’m having trouble wrapping my head around a thought and a new revelation of knowledge and seeing them as exactly the same thing.
C: Healthy check up
T: My body is free from cancer
F: healthy
But let’s say I did have cancer, but it was just missed in my last check up.

Once I know this – I feel like this changes the circumstances, not the thought.

Brooke often coaches though that new knowledge is essentially just a change in thought. Can you help clarify?