You must make a successful touch attack against the intended victim. If the touch attack is successful, the target is allowed a Will save to avoid all negative effects. A failed Will save results in 3 points of permanent Wisdom damage per 4 caster levels. You can intentionally lessen the damage dealt but must declare your intention to do so before the attack is rolled. Damage dealt to the mind by instill foolishness can be healed by normal means (i.e. restoration, wish, miracle, etc.), although if the damage is not healed within 24 hours of the infliction it is permanent and incurable.