`i¥mah is virtually the light of theoretical and pragmatic intellect. An infallible man has the power to prevent the influence of illusion on theoretical intellect and to prevent the influence of lust and wrath on pragmatic intellect so that he will not be polluted with sin and he will strive voluntarily towards virtues and perfection. Pragmatic infallibility is the highest degree of piety which will become manifest in behaviors and deeds.
All the infallible Imams fully receive from Almighty Allah what is related to the guidance of man, comprehend it perfectly, fulfill it properly and convey it to others. This is only possible through intuition, for a man, in the world of illusion, presents his imaginations on the findings of intellect hence misleads others:Have you not seen those who have changed Allah’s favor for ungratefulness and made their people to alight into the abode of perdition? (14:28)
source : AHL AL-BAYT THE CELESTIAL BEINGS ON THE EARTH Allameh Hussein Ansariyan