A fluid mind will always bring rational thought to bear on beliefs. Beliefs should be fluid entities within the mind, some more certain and viscous, others doubtful and mutable. A fluid mind never feels so certain of a belief that it loses its fluidity. When a belief solidifies, it becomes like a shackle on the mind, inhibiting exploration, learning and growth. A fluid mind never allows a belief to be so hardened that it is beyond rational scrutiny.
If, through omission or commission, I have inadvertently displayed any sexist, racist, culturalist, nationalist, regionalist, ageist, lookist, ableist, sizist, speciesist, intellectualist, socio-economicist, ethnocentrist, phallocentrist, vagicentric, heteropatraiarchalist, or any other politically incorrect bias as yet un-named, I suggest you get over it.