Ran across this in reading today. Hope it blesses you like it has me!
"If one wants to have the gospel as a source of power that makes it possible for one to successfully fulfill the law, then one ruins both. The law still remains unfulfilled and the gospel does not remain the gospel. The gospel means a completely new way to God, not through our own successful fulfillment but through that which Jesus has done for us."
Bo Giertz, Commentary on Luke