He who cannot speak well of his trade does not understand it. (French Proverb)

He who cannot speak well of his trade does not understand it.

French Proverb

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speak trade well

Related proverbs

To quarrel with a man of good speech is better than to converse with a man who does not speak well. View proverb
Asian-indian Proverb
Always speak well of the dead. View proverb
Latin Proverb
If you understand the beginning well, the end will not trouble you. View proverb
African Proverb
Speak well of your friend; of your enemy neither well nor ill. View proverb
Italian Proverb
Speak well of your friend; of your enemy say nothing. View proverb
Welsh Proverb