Sekirov Dictionary

zeal without knowledge is a runaway horse

UK /ziːl wɪˈθaʊt ˈnɒ.lɪd͡ʒ ɪz eɪ ˈɹʌ.nə.weɪ hɔːs/US /zil wɪˈθaʊt ˈnɑ.lɪd͡ʒ ɪz eɪ ˈɹʌ.nə.weɪ hɔɹs/

saying1

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Enthusiasm of an inexperienced person cannot be easily controlled.
- They do not understand that “zeal without knowledge is a runaway horse” and that's why they are unproductive. — 2016

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