Ignorance is bliss.
Meaning: If you donít know about something, you donít need to bother about it. In other words, if youíre unaware of something, it wonít cause you stress. This proverb, however, is often used in negative way Ė ignorance is not bliss.
Example: I didnít know that the neighbor next door was involved in criminal activities. Sometimes, ignorance is bliss.