One of the accusations made against teachers of grace is that we do not teach people to obey the Law. Those making this accusation say that since Jesus instructed people to obey the Law, then we should obey the Law and teach others to obey the Law, too.
Those making the claim that we should obey the Law, and also teach others to do so, cite many verses from the earthly life of Jesus to prove that Jesus taught people to obey the Law. They conclude that since Jesus taught people to obey the Law, then so should grace teachers.
One rich man who thought righteousness, or living eternally in the kingdom of God, was achieved through obedience to the Ten Commandments asked... Jesus what he needed to do to gain eternal life (Luke 18:18).
Jesus, knowing his heart, told him to keep the commandments of God.
The man replied he had kept the commandments since he was a child.
Then Jesus told him to go sell all he had, give to the poor, and follow him, then he would have eternal life.
Jesus' disciples asked him how could anyone gain eternal life if this man could not, since this man had obeyed the law from childhood.