Found this quote of Bonhoeffer from a confirmation service in 1938:
“You have only one master now…But with this ‘yes’ to God belongs just as clear a ‘no.’ Your ‘yes’ to God requires your ‘no’ to all injustice, to all evil, to all lies, to all oppression and violation of the weak and poor, to all ungodliness, and to all mockery of what is holy. Your ‘yes’ to God requires a ‘no’ to everything that tries to interfere with your serving God alone, even if that is your job, your possessions, your home, or your honour in the world. Belief means decision.”
See the source of this here – https://livingwittily.typepad.com/my_weblog/2020/02/bonhoeffer-your-yes-to-god-requires-your-no-to-all-injustice-to-all-evil-to-all-lies.html