Good question,
Php 2:13 For it is God which worketh in you both to will and to do of his good pleasure.
Or, does he motivate you to do, and if so, by means of what?
The same Faith that gave us reconciliation is the same method by which we get His life.
Eph 2:8 For by grace are ye saved through faith; and that not of yourselves: it is the gift of God:
The way to have the life of Jesus is to ask for it. Remember its the Spirit that gives us Jesus life.
Luk 11:13 If ye then, being evil, know how to give good gifts unto your children: how much more shall your heavenly Father give the Holy Spirit to them that ask him?
If we ask believing then it will be ours.
Hope that answers your question.
Both the work of reconciliation and overcoming sin are 100% the work of Christ for us and in us.