Mental calmness leads to happiness and contentment.
心の平穏は幸福と満足につながる。 (Kokoro no heion wa kōfuku to manzoku ni tsunagaru.)
"She believes that a peaceful mind is a happy mind."
"彼女は平和な心は幸せな心だと信じている。" (Kanojo wa **heiwa na kokoro wa shiawase na kokoro da** to shinjite iru.)
something that completely changes the way things are done
a complex and interconnected web of thoughts or concepts
to be the person who controls or makes decisions in a family
something that makes someone feel very happy or pleased
to make someone learn from their mistake
a person who always follows the law