Never let your zeal outrun your charity. The former is but human, the latter is divine.

— Ballou, Hosea

Through zeal, knowledge is gotten; through lack of zeal, knowledge is lost.

— Buddha

Experience shows that success is due less to ability than to zeal. The winner is he who gives himself to his work body and soul.

— Buxton, Charles

Zeal without knowledge is the sister of folly.

— Davies, Sir John

Zeal without humanity is like a ship without a rudder, liable to be stranded at any moment.

— Felltham, Owen

Zeal without knowledge is fire without light.

— Fuller, Thomas

I do not love a man who is zealous for nothing.

— Goldsmith, Oliver

Blind zeal can only do harm.

— Lichtwer, Magnus Gottfried

Zeal without knowledge is like expedition to a man in the dark.

— Newton, John

Too much zeal spoils everything.

— Proverb

Zeal is like fire: it needs both feeding and watching.

— Proverb

Zeal is very blind, or badly regulated, when it encroaches upon the rights of others.

— Quesnel, Pasquier

Let a good person do good deeds with the same zeal that an evil person does bad ones.

— Rokeach, Shalom

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

— Shenstone, William

Zeal is fit for wise men, but flourishes chiefly among fools.

— Tillotson, John