In other words, while Goneril and Regan talk as though their love is something quantifiable, Cordelia determines that her love for Lear cannot be measured with words.
Cordelia's sisters, Goneril and Regan, give deceitfully-lavish speeches professing their love, flattering his vanity. Cordelia, seeing right through her sisters' feigned professions of love, refuses to do the same. Lear deems her answer ("Love, and be silent" 1.1.62) as too simple.
Lear asks her,
"What can you say to draw / A third more opulent than your sisters? Speak." (1.1.84-5).
Cordelia replies, "Nothing, my lord." (1.1.86). She continues, "Unhappy that I am, I cannot heave / My heart into my mouth. I love your majesty / According to my bond; no more nor less." (1.1 90-2).
Unlike her father and sisters, Cordelia is able to differentiate love from property. Feeling outraged and humiliated that Cordelia will not publicly lavish love on him, Lear banishes Cordelia from the kingdom.