AMUT

Sprite
Type White Magic LV 4
Effect Removes Silence from one ally
Cures Silence
Target One ally

Learned by

WM
RM
BM
Kn
WW
RW
BW
Ni
Sold In ElfLand (4,000 G)
Of the Spells that actually work, AMUT is the least useful. It doesn't create a resistance to Silence like you might expect, but rather cures it. However, you can't cast it if you are Silenced yourself, which makes its use questionable enough (especially since MUTE hits all targets). Add to that that only four Monsters in the entire game cast MUTE, and this Spell becomes even more iffy. With a price tag of 4,000 G, it's just insulting.
Compare AMUT to other Spells
Shops: Where AMUT is sold – 1 shown
Map Shop
ElfLand L4 Wh.Magic
AICE CUR3

Related

LAMP

Sprite
Type White Magic LV 2
Effect Removes darkness from one ally
Cures Darkness
Target One ally

Learned by

WM
RM
BM
Kn
WW
RW
BW
Ni
Sold In Pravoka (400 G)
Darkness is an annoying Status Ailment, and LAMP is the only way to cure it short of CUR4. However, it may not be worth the level 2 Spell slot, especially considering the other level 2 white magic Spells that are available. You won't encounter Darkness until the Marsh Cave, and it will wear off at the end of combat, so don't feel obligated to learn LAMP.

PURE

Sprite
Type White Magic LV 4
Effect Removes Poison from one ally
Cures Poison
Target One ally

Learned by

WM
RM
BM
Kn
WW
RW
BW
Ni
Sold In ElfLand (4,000 G)
You will be Poisoned quite a lot in the first half of the game, but this Spell is still of questionable use. It's nice for Wh.MAGES, since their level 4 Spell selection is pretty thin, but you could buy 53 PURE Potions for the price of this Spell, and anyone can use those. You may as well pick it up when you're rich, but don't make it a priority.

SOFT

Type White Magic LV 6
Effect Removes Stone from one ally outside of combat
Cures Stone
Target One ally

Learned by

WM
RM
BM
Kn
WW
RW
BW
Ni
Sold In Crescent Lake (20,000 G)
SOFT Potions are expensive, but you can buy 25 of them for the cost of learning the SOFT Spell. Only learn SOFT if you are willing to wait for the White Robe to gain use of the INV2 Spell.

MUTE

Sprite
Hit % 115%
Type White Magic LV 2
Effect Inflicts Status-elemental Silence on all foes
Target All foes
Element Status
Inflict Status Silence

Learned by

WM
RM
BM
Kn
WW
RW
BW
Ni
Sold In Pravoka (400 G)
MUTE is rarely useful, but when it is, it can turn the tide of battle dramatically. Few Monsters cast Spells, and even fewer cast Spells you need to prevent. To make matters worse, many of those have high Magic Defense or resist Status. For the rest, MUTE will cripple their attacks if it hits. Best of all, Silenced creatures will still waste turns trying to cast Spells.

ElfLand

The CROWN and the Mystic KEY
Page 1
Establish a base of operations in ElfLand and begin buying powerful new Spells and gear.

Vox

Type White Magic
Level 4
Effect Cures Mute.
Cures Mute
Target One ally
Price 4,000 gil
Sold In Elfheim

Learned By

WM
RM
BM
Kn
WW
RW
BW
Ni
Ladies and gentlemen, the most useless Spell in the game! Vox cures Mute, but you can't cast it if you are Muted yourself, which is questionable enough right there (especially since Silence hits all targets). Add to that that only four Monsters in the entire game cast Silence, and this Spell becomes even more iffy. With a price tag of 4,000 gil, it's just insulting.