Zeal is fit only for the wise but is found mostly in fools

Too much zeal is a bad soldier who fires before the word of command

Blind zeal can only do harm

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

But zeal moved thee; To please thy gods thou didst it!

But his zeal None seconded, as out of season judged, Or singular and rash.