Early on the irascible German writes:
It is not the mark of a Christian mind to take no delight in assertions; on the contrary, a man must delight in assertions or he will be no Christian. And by assertion--in order that we may not be misled by words--I mean a constant adhering, affirming, confessing, maintaining, and an invincible persevering.--Martin Luther, The Bondage of the Will, in LW 33:19-20
It is one thing to be duly cautious in the name of appropriate intellectual humility. It is another to be cowardly under the guise of intellectual humility.
One day God will bring all things out into the open (1 Cor 4:5).