Through zeal, knowledge is gotten; through lack of zeal, knowledge is lost.
Buddha (563 BC-483 BC) Founder of Buddhism.
Zeal without knowledge is fire without light.
Thomas Fuller (1608-1661) British clergyman and author.
I do not love a man who is zealous for nothing.
Oliver Goldsmith (1728-1774) Irish writer, poet, and physician.
Zeal is like fire: it needs both feeding and watching.
Too much zeal spoils everything.