Equality of Thought

Or in the sense that an assertion/thought should not be able to be buried or overridden simply on account of its origin, but should stand on its own merits.
If person A had the experience that an event was good, and person B had the experience that an event was bad, then both experiences should be considered equally valid and important. Rather than being incompatible and requiring the abandonment of one, they should be incorporated into a broader and more holistic understanding of the event.