A proverb warning that impatience and quick temper cause loss or mistakes; patience and calm are important (similar to 'haste makes waste').
短気は損気だから、怒って契約を破棄する前に一度冷静になろう。
Impatience is costly, so calm down before canceling the contract in anger.
料理は焦ると失敗する。母はいつも『短気は損気』と言って落ち着かせてくれた。
Cooking fails if you rush. My mother always said 'impatience is costly' to help me stay calm.
投資でも慌てて売買するな。短気は損気だよ。
Don't rush trades in investing. Impatience costs you.