The issue is initiative and cause.
God takes the initiative, and His grace is the cause. We are the recipients, the receivers, the benefactors. It's not what we do, but what God does; and out of God's work, He makes us His workmanship, that we should then work in cooperation with Him.
If it were possible to live in fellowship with God through the exercise of our own power, then the Law would not be a source of death, but of abundant life. Yet, because of sin, the Law, which is good and holy, does not bring life, but death; not because the Law is bad or defective but because we are.
Thus it is through God's own initiative to come down to us, to save you, to save me, to save all of us out of His love, out of His kindness that He takes hold of us, who by ourselves are enemies of God and condemned under the Law, and give us Himself and adopt us as His own. That by His grace we should be brought into Himself, and receive from Him the fullness of Himself. That even as God is love, we too are to love. To love as He loved us--this is a work of grace in our lives by the power of the Holy Spirit, freely given not to the righteous, but to unrighteous sinners who are justified freely out of God's most compassionate kindness toward sinners in Christ Jesus.
-CryptoLutheran