When candles are out, all cats are grey. 
Proverbs on a similar topic
- All that glitters is not gold.
- Still waters run deep.
- There is truth in wine.
- None so deaf as those who will not hear.
- Many a true word is spoken in jest.
- A fair face may hide a foul heart.
- Iron hand in a velvet glove.
- Lies have short legs.
- Barking dogs seldom bite.
- Truth is mighty and will prevail.
- Appearances are deceptive.
- A honey tongue, a heart of gall.
- The cowl does not make the monk.
- The face is no index to the heart.
- The biter bit.
- A liar is not believed when he speaks the truth.
- All are not thieves that dogs bark at.
- Children and fools tell the truth.
- A little body often harbours a great soul.
- All are not hunters that blow the horn.
- It is not the gay coat that makes the gentleman.
- All are good lasses, but whence come the bad wives?
- A traveller may lie with authority.
- Great boast and small roast.
- You cannot hide an eel in a sack.
- Liars have need of good memories.
- Truth has a scratched face.
- Fair without, false within.
Related proverbs
Similar proverbs in the same language
English
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All cats are alike grey in the night.
Similar proverbs in another language
Latin
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Tenebris nigrescunt omnia circum.
Darkness darkens all around.
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Nocte latent mendae.
Lies are hidden in the night.
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Sublata lucerna omnes mulieres aequales sunt.
When the light is lifted, all women are equal.
French
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La nuit tous les chats sont gris.
At night, all cats are gray.
German
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Bei Nacht sind alle Katzen grau.
At night all cats are gray.
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Bei Nacht sind alle Kühe schwarz.
At night all cows are black.
Czech
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Potmě každá kočka černá.
Every cat is black in the dark.
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Potmě každá kráva černá.
Every cow is black in the dark.