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

Zeal without knowledge is the sister of folly.

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

Blind zeal can only do harm.

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

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