Faith (status)

Faith is a recurring status effect. If a character has the Faith status, they will usually get a boost to their magic power, though this is a bit more complicated in Final Fantasy Tactics.

Final Fantasy IV
Faith increases magic power.

Final Fantasy XII

 * "The character is pure of thought and at one with the arcane, increasing magick potency. The effect is temporary."

Faith increases the target's magick power by 30-50%.

Final Fantasy XII: Revenant Wings
Faith is a positive status effect that raises a unit's Magick Attack. Penelo's Mystic Dance and the Judge of Wings's Heroism are a few of the spells that may grant this effect.

Final Fantasy XIII
Faith can be granted by a number of spells as well as the Fortisol item. When granted by the spell Faith, magic attack is increased by 40%, but when granted by Faithra, magic attack is increased by 80%.

Final Fantasy Tactics
While under Faith, a unit is treated as if they have maximum (100) Faith points without inflicting the consequence of raising the permanent Faith statistic too high, which would cause the unit to leave party after the fight. The opposite of the status Faith is Atheist.

The Mystic's Belief and Templar's Faith can grant this status, and the Rod of Fate weapon will grant the equipper auto Faith status.