Literally: doubt – heart – dark – ghost
Alternately: Once you allow suspicion or fear into your heart, everything will start to seem menacing. Even though nothing is actually there, a doubting heart fills the darkness with monsters.
Notes: Normally I’d deal with 鬼 by leaving it as oni, but here my sources specify that the 鬼 character refers to the malevolent spirits of the dead – and the fact that we the living can work ourselves up into a state of terror over them even though they don’t really exist.
A more kotowazaesque version adds a particle and verb: 疑心暗鬼を生ず (gishin anki wo shouzu), i.e. the doubting heart “gives birth to” ghosts in the darkness.
This phrase comes to us from the Liezi (列子, in Japanese Resshi), which we’ve seen before.
For the first time in a long time I actually knew one of your phrases (:
Some of them have been pretty obscure, haven’t they?
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