"Let no one become like a bitter plant that grows up and causes many troubles with its poison."

(Hebrews 12.15 GNB)

Bitter words and bitter people drag down everyone around them, including themselves.

Being bitter is not the same as being frank. One can be constructive in honest words - with the sincere intent to build up, not to tear down. And some bitter people are sometimes a bit delusional - their expectations do not align with reality and they blame others or the world.

Understanding and acknowledging that myself might be the source of the problem and to find what I need to do to fix it - this is important.

Another thing that is important is to recognise and be grateful for God's steadfast love.

Related:
Only helpful words
Bitter or grateful
Serve with a right heart
Steadfast love