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What message about brains, heart, and courage is shown through Dorothy’s companions?

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Illustration by W.W. Denslow showing Dorothy comforting the Cowardly Lion on a yellow brick road, with Toto, the Tin Woodsman, and the Scarecrow nearby in a forest. — The Wonderful Wizard of Oz An illustrated page by W.W. Denslow in L. Frank Baum's *The Wonderful Wizard of Oz*.

In L. Frank Baum’s The Wonderful Wizard of Oz, the journey of Dorothy’s companions—the Scarecrow, the Tin Woodman, and the Cowardly Lion—conveys the enduring message that individuals often already possess the qualities they believe they lack.1

Throughout their travels, the companions demonstrate these virtues long before they receive symbolic tokens from the Wizard:

Brains: Despite his belief that he lacks intelligence, the Scarecrow consistently displays good sense and problem-solving abilities that help the group overcome obstacles.1
Heart: Although he feels he is missing a heart, the Tin Woodman acts with profound kindness and compassion throughout the adventure.1
Courage: The Cowardly Lion, while convinced of his own cowardice, repeatedly exhibits bravery in the face of danger.1

Ultimately, the Wizard’s gifts of a bran-filled head, a silk-and-sawdust heart, and a liquid "courage" are merely external validations of the internal strengths the characters had demonstrated all along.1