The man that has put his faith on the redemptive work of Jesus is saved completely. The work of redemption can't be complete and it's effect partial. Jesus didn't wrought a partial salvation. The fact that He rose again is proof that redemption is complete. That is the wages of sin has been fully paid. Once this happened resurrection happened and our High Priest took His place. Once He took His place forever nothing can stand against us. His life is guarantee that redemption is irreversible.