それなればこそ

Meanings

for that very reason; that's exactly why

usually written using kana alone

A somewhat formal or literary expression used to emphasize that a preceding statement is the very reason for what follows. Often used in explanations or arguments.

彼かれは努ど力りょくを惜おしまなかった。それなればこそ、成せい功こうしたのだ。
He spared no effort. That's exactly why he succeeded.
この問もん題だいは複ふく雑ざつだ。それなればこそ、慎しん重ちょうに検けん討とうする必ひつ要ようがある。
This issue is complex. For that very reason, we need to examine it carefully.