J. M. Barrie Quote

MISS SUSAN: What is algebra exactly; is it those three- cornered things?
PHOEBE: It is x minus y equals z plus y and things like that. And all the time you are saying they are equal, you feel in your heart, why should they be?

The Plays of J.M. Barrie - Quality Street, Act II (p. 115), Charles Scribner's Sons. 1948