Man doesn't struggle to have the Grace of God. Grace doesn't come by human works. Grace is the operation of the power of God's Salvation in the human soul. Grace makes men the workmanship of God not by human works but by the finished work of Christ that flows from Calvary. Men do not struggle to obtain Grace. Grace is freely given because of your personal belief and acceptance of Christ as Lord and Savior. Under law men struggled! Under Grace men receive the blessing of Christianity..."freely".
Rom 8:32...He that spared not his own Son, but delivered him up for us all, how shall he not with him also freely give us all things?
1 Cor 2:12...Now we have received, not the spirit of the world, but the spirit which is of God; that we might know the things that are freely given to us of God.