حقائقُ الأشياء ثابتة
The realities of things are established.
This does not mean that everything someone believes is true. Two people can make incompatible claims about the same event; the event itself is not created by either person's assertion.
Whether a stone actually fell into water is distinct from someone's conception of that event and from the truth of a witness's statement. Reality, conception and judgment must not be identified.