I respond to the call of the Father each and every day the same, a new and hopefully better surrendered life. Anything good that comes from the life I've freely given to Him is not me doing it, but the Spirit of Christ inside me doing it. If I do something opposite of good in God's eyes, that's not me doing that either, but sin dwelling in me doing it.
So true NT saving Faith, pisteuo, a continually surrendered life to Him, gives the Spirit of Christ power to overcome what the Greek describes as trench warefar between The Spirit of Christ and the sinful nature warring inside us for our souls. We are merely onlookers, with only the choice of who we are surrendering our lives to. If we aren't surrendering ourselves to Christ, we are automatically surrendering to our sinful natures.
This all takes courage and endurance, which takes work and effort. Not added to the finished work of Christ, just fulfilling pisteuo or saving Faith.
If we don't start the salvation journey with the surrendered life, there is no warfare inside us. The sinful nature is getting the surrendered life.