only because ...
Verb conditional
This grammar point is used to strongly emphasize a reason. It indicates that a specific condition or reason is the only or primary factor that leads to a certain result. It is often used in formal or literary contexts to express that something difficult or unusual is done precisely because of a certain feeling or situation.
Verb ば stem + こそ
The verb is conjugated into its conditional ば form, followed immediately by the particle こそ to add intense focus to the reason.
愛していれ
It is precisely because I love you that I am being strict.
健康であれ
It is only because there is health that we can work.
将来を思え
It is precisely because I think of your future that I say this.