Commentary for Berakhot 67:1
חברותא כלפי שמיא מי איכא אי לא כוון דעתיה מעיקרא מחינן ליה במרזפתא דנפחא עד דמכוין דעתיה:
Has anyone intimacy with Heaven ? If he did not at first direct his mind [to his prayer], we smite him with a smith's hammer until he does direct his mind.
Abraham Cohen Footnotes to the English Translation of Masechet Berakhot
I.e. has anyone the right to address God thoughtlessly as one talks with a familiar friend?
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Abraham Cohen Footnotes to the English Translation of Masechet Berakhot
That means, we forcibly impress upon him the necessity of Kawwanah.
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