expression, godan verb (-tsu)
harsh words cause trouble; the way you say something can offend or not
Proverb meaning that the manner of speaking can either cause friction or keep things smooth; often used to remind someone to choose words carefully.
物も言いようで角が立つから、もう少し柔らかい言い方をしたほうがいいよ。
Since harsh words make the going rough, you should phrase it a bit more gently.
Even with the same content, don't forget that the way you say it can cause offense or not.