(Luther makes the following general comment on Romans 2:6-10): "Patient continuance is so altogether necessary that no work can be good in which patient continuance is lacking. The world is so utterly perverse and Satan is so heinously wicked that he cannot allow any good work to be done, but he must persecute it. However, in this very way God, in His wonderful wisdom, proves what work is good and pleasing to Him. Here the rule holds: As long as we do good and for our good do not encounter contradiction, hatred, and all manner of disagreeable and disadvantageous things, so we must fear that our good work as yet is not pleasing to God; for just so long it is not yet done with patient continuance."
Luther's Commentary on Romans, trans. J. Theodore Mueller, Grand Rapids: Kregel Publications, 1976, p. 55. Romans 2:6-10.