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According to [[Castiel]], angels are not omniscient beings,<ref name="four07">[[4.07 It's the Great Pumpkin, Sam Winchester]]</ref> although their knowledge, especially that of [[archangels]], is extensive. Their angelic power exists in the form of [[grace]]. [[Anna]] voluntarily removed her grace in order to be reborn human. She describes the grace as "an energy", but this energy is somehow connected to an angel's true form. Anna said that the removal of her grace was very painful. Despite the fact that an angel's power is connected to its grace, Anna still demonstrated telekinesis and superhuman strength. Anna also heard other angels conversing in Heaven but could not respond.<ref name="four09">[[4.09 I Know What You Did Last Summer]]</ref> The restoration of grace replenishes the angel's powers and abilities.<ref name="four10" />
The "physical appearance" of an angel's true form varies. For instance, [[Lucifer]]'s angelic form is said by [[Uriel]] to be beautiful.<ref name="four16">[[4.16 On the Head of a Pin]]</ref> His eye color changed from blue to red, probably due to his time in hell, and he also has growled, indicating an animalistic side. [[Zachariah]]'s angelic form has four faces and six wings, according to him, though Sam and Dean are not able to perceive him in this way in [[Heaven]].<ref name="five16" /> Castiel states that his true angelic form is the size of the Chrysler Building.<ref name="six07">[[6.07 Family Matters]]</ref> Within the show, an angel's true form is often seen as brilliant white light. Psychic [[Pamela Barnes]]' eyes are burnt out when she looks on Castiel's true form. [[Michael]]'s voice and true form prove fatal to several bar patrons.<ref name="five18" /> For these reasons, angels most often communicate with humans through dreams, or through a [[vessel]].
An angel's true voice is often heard as an ear piercing, high-pitched sound which can shatter glass. Castiel tries to speak to Dean with his true voice and is surprised when Dean cannot understand it because he is the vessel of Michael.<ref name="four01" /> Some humans, in fact, can understand this true voice, but to most it is overwhelming, painful, or sometimes fatal to behold.
