An interesting Russian expression I learnt recently is меньше знаешь – лучше спишь (men’she znayesh’ – luchshe spish’), which means “the less you know, the better you sleep”, and is equivalent to the English expression ignorance is bliss.
While it might be true that you sleep better if you have less to worry about, I don’t agree with Thomas Gray about the value of ignorance and the folly of being wise.
Similar sayings include out of sight, out of mind, and what you don’t know can’t hurt you.
What about in other languages? Are there similar sayings?