True zeal is the child of charity as being its ardour; wherefore, like to charity, it is patient, is kind, envieth not, dealeth not perversely, seeketh not her own, is not provoked to anger, rejoiceth in the truth. The ardour of true zeal resembles that of the huntsman, being diligent, careful, active, industrious, eager in pursuit, but without passion, anger or disquiet, for if the huntsman's work were done in anger, bad temper and vexation, it would not be so much loved and desired. Zeal in like manner has ardours which are extreme, but constant, solid, sweet, industrious, equally agreeable and untiring; whereas on the contrary, false zeal is turbulent, troubled, insolent, arrogant, choleric, transient, equally impetuous and inconstant.
--St. Francis de Sales, Treatise on the Love of God
