What the eye sees not, the heart rues not.

Meaning: Ignorance of misfortune shields us from suffering its emotional weight.

Origin: Recorded in A Dictionary of English Proverbs and Proverbial Phrases, an undated collection published in London by Whittaker & Co. around 1880 and credited to Thomas Preston. Its earlier history hasn't been traced.

Equivalents in French, Spanish, Japanese, German, Italian, and 4 more languages

French: Ce qu'œil ne voit, au cœur ne deult (literally: What the eye does not see does not grieve the heart)
Spanish: Ojos que no ven, corazón que no siente (literally: Eyes that do not see, heart that does not feel)
Japanese: 知らぬが仏 (Shiranu ga hotoke) (literally: Not knowing is Buddha)
German: Was ich nicht weiß, macht mich nicht heiß (literally: What I don't know doesn't make me hot)
Italian: Occhio che non vede, cuore che non duole (literally: An eye that doesn't see, a heart that doesn't ache)
Portuguese: O que os olhos não veem, o coração não sente (literally: What the eyes don't see, the heart doesn't feel)
Dutch: Wat het oog niet ziet, het hart niet deert (literally: What the eye doesn't see doesn't hurt the heart)
Polish: Czego oczy nie widzą, tego sercu nie żal (literally: What the eyes don't see, the heart doesn't miss)
Chinese: 眼不见，心不烦 (Yǎn bú jiàn, xīn bù fán) (literally: What the eye doesn't see doesn't trouble the heart)