Does the Magic stat affect all magic or only offensive spells?

From "The Ultimate Strategy Guide" FAQ:

Magic (Mag):

Magic is used to power up the magic that a character can use. This includes summons as well as regular magic and enemy skills. The higher your Mag, the higher damage you'll hit with magic.

I can't tell if it affects healing and protection too, or just offensive spells.

Does the Magic stat affect all magic? Or just offensive spells?

Solution 1:

Yes, Magic affects healing. The formula to calculate how much you heal with Cure is:

6 * (Magic + Level) + 22 * Power

So the higher the Magic stat, the more HP that character will heal with a given Cure spell.

Source