The Temperate Mason is free because his passions, or uncontrolled limbic system, are no longer in control. His rational mind takes hold of the reins, establishing executive functioning and the willpower to overcome. This is done vis-à-vis the development and strengthening of the Pre-Frontal Cortex (PFC).
Freemasonry inculcates virtue and moral rectitude in its members by way of exemplifying the Cardinal Virtues of Prudence,
Temperance, Fortitude, and Justice: all which were absent from the Stanford Prison Experiment.