The president of the Southern Baptist Convention called on pastors to resist an upcoming Supreme Court ruling on state gay marriage bans, saying “this is a Bonhoeffer moment for every pastor in the United States.”

In his speech before thousands of Southern Baptist messengers gathered in Columbus, Ohio, Ronnie Floyd quoted German theologian Dietrich Bonhoeffer, who is best known for his staunch resistance to the Nazi dictatorship: “Silence in the face of evil is itself evil. God will not hold us guiltless. Not to speak is to speak. Not to act is to act.”

He warned that the time had come for every pastor to speak out against the upcoming ruling.

“That's what Bonhoeffer did,” he said.

The nation's highest court is expected to hand down its ruling at any moment. The decision could strike down the nation's remaining 13 bans, which would lead to nationwide marriage equality.

“The Supreme Court of the United States is not the final authority nor is the culture itself,” Floyd said. “The Bible is God's final authority about marriage and on this book we stand.”

A resolution before conventioneers states that “Southern Baptists recognize that no governing institution has the authority to negate or usurp God's definition of marriage.”