Zeal is that pure and heavenly flame,
The fire of love supplies;
While that which often bears the name,
Is self in a disguise.

True zeal is merciful and mild,
Can pity and forbear;
The false is headstrong, fierce and wild,
And breathes revenge and war.


John Newton,
in
Olney Hymns (1779)
Hymn 70 : True and False Zeal