Study with a Mentor

Fourth, and only if you allow it, the wizard can return to his old mentor and, with luck, copy a few spells out of his master's spell book. Use this method if, and only if, you feel it is important for player characters to have more than a few new spells each time they advance to a new spell level. Allow the characters to gain too much this way, or too frequently, and they will come to rely upon it, not using their own playing ability to develop their characters.

(See also
Wizard Spells from the Player’s Handbook, Wizard Spells from the Tome of Magic, Wizard Spells by School—Master Listing, Tome of Magic)

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