 So the state of grace means you're remaining in God's kindness, His gracious love for you and grace as His very life that is in you when you're in the state of grace. So to remain in God's kindness means simply to remain in the state of grace, to not turn against God through sin. Mortal sin, of course, extinguishes the life of grace in the soul. It's as drastic as if you had put a gun to your head and pulled the trigger.