You can;pt claim we are saved by grace, then claim we have to work to keep it.
The branches are us. Thrown into the fire means Hell5I am the vine; you are the branches.
If anyone does not abide in me he is thrown away like a branch and withers; and the branches are gathered, thrown into the fire, and burned. 7If you abide in me, and my words abide in you, ask whatever you wish, and it will be done for you. 8By this my Father is glorified, that you bear much fruit and so prove to be my disciples.