Who said "One can only speak of what one doesn't know."?

This quote is attributed to Lacan, Jacques.

One can only speak of what one doesn't know. - Lacan, Jacques

"One can only speak of what one doesn't know."

Lacan, Jacques Knowledge

Psychoanalyst-Philosopher French 1901–1981

"The unconscious is structured like a language."

"I am not what I am."

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"We're not just after treasure. We're preserving history."

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"A tidy room reflects a tidy mind."

"You can learn a lot about a person by how they keep their space."