know whereof one speaks

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know whereof one speaks

to know well the subject that one is speaking about. You are wrong! You do not know whereof you speak. He simply doesn't know whereof he speaks.
See also: know, one, speak
References in periodicals archive ?
Also, the remuneration for the board of directors shall be EUR531,200 to be allocated with EUR175,000 to the chairman, whereof EUR75,000 is additional remuneration based on the extraordinary work load in the coming year and EUR 49,500, whereof EUR16,500 is an additional compensation based on the extraordinary work load in the coming year, to each six other members of the board.
1) The acquisition of not more than 2,950,000 series A shares, whereof a maximum of 2,900,000 may be transferred to option holders under the performance based personnel option plan 2017.
Girls wore new frocks and boys sported new trousers - short, in the 1950s whereof I speak.
And 'tho sometimes to his neighbours His tales became a joke, All his buddies listened quietly For they knew whereof he spoke.
Each student would get two hundred thousand each in four equal annual installments, first installment whereof were distributed in the ceremony.
Pope Francis knows whereof he speaks; he was archbishop of Buenos Aires, where drug trafficking and addictions are common.
If you or anybody else had made an on-site visit to the location and tried making a left turn on to High Street Extension from Old Common Road and then compared the risk factor with traffic signal at Bolton Orchard intersection, you would know whereof I speak.
Talking on the occasion Minister of State for IT, Anusha Rehman apprised the Acting Chairman about the focus of the current government to curb the menace of grey traffic and as a result whereof, the state of the art equipment now in place, should be efficiently and effectively used to block all illegitimate IPs, being used for grey trafficking, causing a huge loss of revenue to the government exchequer.
The Bible says that God "has appointed a day in which He will judge the world in righteousness by that man whom He has ordained; whereof He has given assurance unto all, in that He has raised him from the dead".
The meeting discussed a number of issues, on top of these is the committees' hosting of officials from different respective governmental entities, whereof the Office discussed the number of hearings and the issues discussed by the committees in the current period so as to achieve the goals of these issues.
IN WITNESS WHEREOF, I have hereunto set my hand this 1st day of August 2011, the two-hundred thirty-sixth year of the Independence of the United States of America.
And it came to pass, in the January edition of History Today, that David Crystal spoke of English grammar, the laws whereof forbid us to write 'and' at the begriming of a sentence ('The King's Good Book').
28 defendants are targeted in the investigation, whereof six are put on international wanted list, including the second President of Kyrgyzstan Kurmanbek Bakiyev, his brother - former head of the State Security Service Zhanysh Bakiyev, his son - Marat Bakiyev, former Prime Minister Daniyar Usenov, former head of intelligence Murat Sutalinov and former commander of Special Forces "Arstan" Esenbay uulu Baiysh.
The registered capital of OMV consists of 300 million shares whereof 1,219,695 treasury shares held by OMV are not entitled to vote, thus resulting in a total of 298,780,305 voting rights.
Curt knows whereof he speaks, and he writes with authority.