True faith in Allah (al-yaqeen) and the Day of Judgment are recognized by their effect on a person’s actions. The faith of the one who testifies to falsehood, drinks alcohol or transgresses on the rights of people is nothing but an illusion in the mind, not a faith based on certainty, because this faith has had no effect on the actions of the limbs or the tongue. True faith is that which controls a person’s behavior and decides what type of deeds he performs.