Oh that wisdom was half as zealous for converts as ridicule.
— Franz Grillparzer

Bigot: One who is obstinately and zealously attached to an opinion that you do not entertain.
Ambrose Bierce zealous quote

I do not love a man who is zealous for nothing.
— Oliver Goldsmith

Zealous men are ever displaying to you the strength of their belief. while judicious men are showing you the grounds of it.
— William Shenstone

One who has not only the four S's, which are required in every good lover, but even the whole alphabet; as for example... Agreeable, Bountiful, Constant, Dutiful, Easy, Faithful, Gallant, Honorable, Ingenious, Kind, Loyal, Mild, Noble, Officious, Prudent, Quiet, Rich, Secret, True, Valiant, Wise; the X indeed, is too harsh a letter to agree with him, but he is Young and Zealous.
— zealous quotation by Miguel de Cervantes