Does Magic Resistance keep out helpful spells like healing spells?
Yes. Magic resistance protects against all spells and magical things – even spells the magus casts on himself – unless he consciously suppresses his Parma Magica (p. 85). While the magus’s Parma is suppressed, all spells can get through, so it is best to do this only when the surroundings are safe. Note that an unconscious or unaware magus cannot voluntarily suppress his Parma.
