six ears with different thoughts, which means if three people or more know a secret, it will not be a secret soon; also means one should not easily believe a rumor, as it will not be beneficial
Definitions (粵典–words.hk)
語句
三個人有六隻耳，各自都有唔同意見，比喻人多難揾共識 it is difficult to get an agreement out of more than two people; three people will never find a consensus; literally: six ears and different strategies