In relation to the exoteric religious life, certainty is the sister of religious life in its perfection (ehsân), that is, to say the adoration of Allah according to the visionary way; through this channel it is the pillar of Islam in the accomplishment of its external practices, as it is the foundation of faith (iman) in its internal dogma. It is, in fact, ihsân which gives the external religion its true meaning and the domain of faith its real values. It occurs in the Quran about certainty, "And worship your Lord until there comes to you the certainty".[1][2] Certainty (yaqeen) comprises three degrees.