It is the witness alone that can work without any desire, without any idea of going to heaven, without any idea of blame, without any idea of praise. The witness alone enjoys, and none else.
Let me be clear that I'm not God so I can't tell you who is and isn't going to heaven. What I know about my relationship with Christ is that as a believer, I am eternally secure. I gave my heart to Christ and that gift of salvation is irrevocable.