We did nothing to obtain the grace of God, it is free gift from God as the bible says:
"For it is by grace you have been saved, through faith—and this isn't from yourselves, it is the endowment of God… " (Ephesians 2:8).
Being saved by grace does not give us the permit to continue living in sin, we should be mindful of how we live our lives. We must honour God for such a wonderful and a great gift He has given to us free of charge.