Wayne Grudem, in his systematic theology argues. "There were no perfect churches at the time of the new testament and there will be no perfect churches until Christ returns. This means that Christians have no obligation to seek the purest church they can find and stay there, and then leave it if a purer church comes to there attention" While no one would dispute the 1st sentence, I have some questions about the second. 1) Do Christians not have an obligation to find and join the 'purest church'? 2) How much 'impurity' in a local church should a believer have to tolerate? 3) When does a church cease to be a N.T church? 4) What should a Christian do, if in a church, with high levels of impurity?