Christna says, unwillingly, i may ingly, bit without any possibility of spiritual life. This person will be swept into spiritual life in the next line and will make continuous progress until he or she attains enlightenment. So that assurance is given by none other than god. God is in charge of quality control and spirituality. We are bound to so that that to that level, we are safe as long as we hold on to spiritual life. But it's even better if we attain enlightenment in this life. And that will propel us.