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〜ばこそ: precisely because
N1 · 03 Reasons and causes
Stresses that the true reason for something is X, often a positive one.
Verb or adjective ば-form + こそ (a clause ending in こそ). It clarifies the reason, often one the listener may misunderstand: "I do it precisely because ...". Followed by a fact.
Examples
君の将来を思えばこそ、厳しいことを言うのだ。
It is precisely because I think of your future that I say harsh things.
家族がいればこそ、頑張れるのです。
It is precisely because I have my family that I can work hard.