“They hated him and couldn’t speak to him amicably.”
~ Genesis 37:4
Seeing that their father Jacob loved Joseph most, his brothers hated him.
With such strong sentiments – of course they couldn’t speak harmoniously – so why state the obvious?
To teach something counterintuitive: never communicate something verbally which you don’t feel emotionally. Although it seems better to always speak kindly, kind words can be cruel when they’re inconsistent with how you really feel.
While carelessly expressing what you honestly think or feel can be harmful, it’s far more destructive to be deceitful.