Zeal without knowledge is the sister of folly. (Quote by - Sir John Davies)

Zeal without humanity is like a ship without a rudder, liable to be stranded at any moment. (Quote by - Owen Felltham)

Through zeal knowledge is gotten, through lack of zeal knowledge is lost. (Quote by - Buddha)

Blind zeal can only do harm. (Quote by - Magnus Gottfried Lichtwer)

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. (Quote by - Charles Buxton)

Let a good person do good deeds with the same zeal that an evil person does bad ones. (Quote by - Shalom Rokeach)

Zealous men are ever displaying to you the strength of their belief, while judicious men are showing you the grounds of it. (Quote by - William Shenstone)

Zeal is fit for wise men, but flourishes chiefly among fools. (Quote by - John Tillotson)