“Though she be but little, she is fierce.”
Physical size is separated from force of character, giving the line its enduring use as a compact statement of spirited strength.
Source details
A Midsummer Night’s Dream, Act III, Scene 2; Helena describes Hermia during the lovers’ quarrel. Verified in the scan-backed 1918 Yale Shakespeare edition edited by Willard Higley Durham; direct evidence resolves to the reviewed Act III transcription.