John 18:10: Man without grace may courage show

Man without grace may courage show,
And much for Christ presume to do:
His zeal is all unsanctified,
His efforts are the starts of pride,
The eagerness of nature's haste,
Too fierce too violent to last.

Even the zeal which God bestows,
And as a placid stream it flows,
Returning to its Source above;
Its fervour is the flame of love,
From all the dross of nature pure,
And shall eternally endure.