Thanks for all the nice comments!

I got the monkeys because they represent the proverb of see no evil, hear no evil, speak no evil.
there is not really only one explanation for the meaning of the phrase, but for me it simply represents a way to avoid spreading “evil”. So by not listen to evil things they do not influence you (gossip etc.). To not read things that are evil or look at evil things so they do not influence you, and lastly to not in speech repeat evil things so they cannot be spread.