Trusting God
Honors Him

It is the nature of faith that the man who believes another does so because he considers him a true and veracious person. This is the greatest honor one person can bestow on another, just as, on the other hand, it is the greatest dishonor to regard a person as a base, false, and frivolous man. So, then, when the soul firmly believes God's Word, it considers Him veracious, true, and just, and thus bestows the greatest possible honor upon Him. For thereby the soul acknowledges that He is right, thereby it honors His name and lets Him act according His good pleasure, because it does not doubt that He is true and veracious in all His words. 

On the other hand, one cannot offer God a greater dishonor than not to believe Him. By so doing the soul considers Him unfit, false, and frivolous and, for its part, denies Him by its unbelief and, in opposition to God, sets up its own opinion in its heart as an idol, as if it knew things better than He.

Source: Quoted in Ewald M. Plass, What Luther Says, A Practical In-home Theology for the Active Christian. St. Louis: Concordia Publishing House. 1959 Edition, 10th Printing (1994), p. 474.