It is impossible . ( Romans 3 v 23 )

The path of legalism is a dead end,so writes Derek Tidball, most religions demand that one obeys certain rules if one is going to be accepted.The JWs are expected to do their appointed hours on the    doorsteps,the Jews have many rules they are meant to keep Derek Tidball  does point out that most Jewish Christians would have agreed that the Law was not merit- earning or favour- inducing.But this still plagued the church by stressing that these rules and laws were indispensable.Those who add on anything to the Gospel are in grave error.Our acceptance by God rules out law keeping,if we are to be saved  then it must be Christ and His finished work that saves.The law which is good was never meant to save us, it was yes to be obeyed, but not to save, no ,but it has another lesson to teach us, and its this,we are sinners. The fact is no one except Jesus ,who never sinned,can or could ever  not break the law, our sinful nature,makes it impossible to keep the law.