A problem shared is a problem halved

Meaning: Talking about difficulties with others makes them easier to bear and to solve.

Origin: A saying about the relief of confiding in someone. Its origin has not been firmly traced, and sources disagree on how old it is.

Equivalents in French, Spanish, Japanese, and German

French: Un problème partagé est un problème à moitié résolu (literally: A problem shared is a problem half solved)
Spanish: Un problema compartido es un problema reducido a la mitad (literally: A problem shared is a problem halved)
Japanese: 悩みは分かち合えば半分になる (Nayami wa wakachiaeba hanbun ni naru) (literally: If you share your worries, they become half)
German: Geteiltes Leid ist halbes Leid (literally: Shared sorrow is half the sorrow)

Walls have ears — Be careful what you say — you may be overheard in unexpected places.
The one who tells the stories rules the world — Whoever controls the narratives shapes beliefs, cultures, and civilizations.
Well done is better than well said — Actions and results are far more valuable than promises and fine words.
A word once spoken can never be recalled — Choose your words carefully, for once said they cannot be unsaid.
Kindness is a language the deaf can hear and the blind can see — Acts of kindness transcend words and communicate beyond all physical limitations.
He who talks much errs much — The more you speak, the more likely you are to make mistakes or say the wrong thing.

wear your heart on your sleeve — to display emotions openly; to be transparent about feelings.
mad as a box of frogs — completely crazy; chaotic and unpredictable.
bark up the wrong tree — to pursue a wrong course; to blame the wrong person.