だからこそ

expression

for this very reason; that is exactly why

Emphasizes that the preceding reason is the decisive cause. Often used to draw a strong conclusion or to highlight a unique justification.

• 彼かれは努ど力りょくした。だからこそ成せい功こうしたのだ。

  He worked hard. That is exactly why he succeeded.

• この問もん題だいは難むずかしい。だからこそ挑ちょう戦せんする価か値ちがある。

  This problem is difficult. For this very reason, it is worth tackling.