Talking of poetry, hauling the books
arm-full to the table where the heads
bend or gaze upward, listening, reading aloud,
talking of consonants, elision,
caught in the how, oblivious of why:
I look in your face, Jude,
neither frowning nor nodding,
opaque in the slant of dust-motes over the table:
a presence like a stone, if a stone were thinking
What I cannot say, is me. For that I came.

Adrienne Rich

http://www.poemhunter.com/poem/in-a-classroom/