Say that she rail; why then I'll tell her plain.
She sings as sweetly as a nightingale;
Say that she frown; I'll say she looks as clear
As morning roses, newly washed with dew;
Say she be mute and will not speak a word,
Then I'll commend her volubility
And say she uttereth piercing eloquence. [ William Shakespeare ]

He will lie, sir, with such volubility that you would think truth were a fool. [ William Shakespeare ]

Literature has her quacks no less than medicine: those who have erudition without genius, and those who have volubility without depth. [ Colton ]