Yes Jesus' saved us and he sustains us but no where does it say that we do not have to obey him.
He summed up all the commandments with, A new commandment I give you, Love one another as I have Loved you.'
Do you? I know I don't..
Failure to live the unlovely in a costly sacrificial way is disobeying Jesus.
It means we are not demonstrating our love for him.
I tell you, unless your righteousness surpasses that of the scribes and Pharisees, you will not enter into the kingdom of heaven.
Peace be with you!