“If I loved you less, I might be able to talk about it more.”
The difficulty of speaking is used as evidence of emotional depth, contrasting sincere feeling with polished or excessive declaration.
Source details
Emma, Volume III, Chapter XIII, scan-backed 1816 John Murray first edition on Wikisource. George Knightley tells Emma “If I loved you less, I might be able to talk about it more” during his declaration, explicitly contrasting the depth of his feeling with his difficulty making polished speeches.