からこそ

expression

precisely because; exactly because

Emphasizes that the stated reason is the very cause of the result. Often used to justify or explain a strong conviction, action, or feeling.

• あなたがいたからこそ、成せい功こうできたんです。

  It is precisely because you were here that we succeeded.

• 難むずかしいからこそ、やりがいがある。

  It is exactly because it's difficult that it's worth doing.