Nobody has ever measured, even poets, how much a heart can hold.

The line asserts that human emotional capacity—love, grief, longing, endurance—resists quantification. By adding “even poets,” Fitzgerald invokes those most devoted to articulating feeling, suggesting that language and art can approach the heart’s depths but never fully take its measure. The quote’s force lies in its paradox: we constantly try to name and size our inner lives, yet the heart’s ability to contain contradictory emotions and survive extremes remains unknowable. Read this way, it is both a tribute to emotional expansiveness and a warning against reductive judgments about what people can bear or feel.