This line “teach me half the gladness that thy brain must know” most directly express envy for the subject of the work.
Envy, in simple terms, is wanting to possess the quality or object which belongs to another. In this line, the speaker wants to be taught of the gladness, meaning that the speaker desires to have that attribute for himself/herself too.
The phrase that was used to directly express envy is “teach me half the gladness that thy brain must know”.
It should be noted that a phrase is a incomplete sentence that's used to express a concept.
In this case, the phrase that was used to directly express envy is “teach me half the gladness that thy brain must know”.
This was necessary to move the plot forward.
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