“Nothing weighs on us so heavily as a secret.”
Rien ne pèse tant qu'un secret.
Book VIII (1678-1679), fable 6.
Fables (1668–1679)
Variant: Nothing weighs more than a secret.
Original
Rien ne pèse tant qu'un secret.
Fables (1668–1679)
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Jean De La Fontaine 47
French poet, fabulist and writer. 1621–1695Related quotes
“Nothing makes us so lonely as our secrets.”

1960s, The American Promise (1965)
“Dreams weigh nothing. - Marie Antoinette”
Source: Marie Antoinette: Princess of Versailles, Austria - France, 1769

John The Beloved Disciple In His Old Age: On Jesus The Word
Jesus, The Son of Man (1928)
Context: We are all sons and daughters of the Most High, but the Anointed One was His first-born, who dwelt in the body of Jesus of Nazareth, and He walked among us and we beheld Him.
All this I say that you may understand not only in the mind but rather in the spirit. The mind weighs and measures but it is the spirit that reaches the heart of life and embraces the secret; and the seed of the spirit is deathless.
The wind may blow and then cease, and the sea shall swell and then weary, but the heart of life is a sphere quiet and serene, and the star that shines therein is fixed for evermore.

“That's the paradox of loss: How can something that's gone weigh us down so much?”
Source: The Storyteller

“A feather will weigh down a scale when there is nothing in the opposite one.”
Book II, Chapter I, On the Progress of Wealth, Section V, p. 355
Principles of Political Economy (Second Edition 1836)