Spell Mastery

(Player's Handbook v.3.5, page 100, DnD 3.5)

[Special]

You are so intimately familiar with certain spells that you don't need a spellbook to prepare them anymore.

Prerequisite

Wizard level 1

Benefit

Each time you take this feat, choose a number of spells equal to your Intelligence modifier that you already know. From that point on, you can prepare these spells without referring to a spellbook.

Normal

Without this feat, you must use a spellbook to prepare all your spells, except read magic.