Dietrich Bonhoeffer: A Spoke in Hitler's Wheel?

Recently there has been some discussion about the quote often attributed to Bonhoeffer about the Christian’s duty to be or put a “spoke in the wheel” of an unjust government or social order. The quote takes several forms as it gets repeated. But the “gist” of it is that the job of a Christian in relation to an unjust government is to be or put a spoke in the wheel of that government to stop it.

Here some have questioned whether that quote really goes back to Bonhoeffer or if it was invented by someone later and somehow got attributed to Bonhoeffer.