Do you recieve Eternal life or salvation because of what you do or in spite of?

Fact, Eternal life is a gift, gained by simply believing IN Jesus Christ. (Jn 6:47 JN 3:16, Eph 2:8-9, 1Tim 1:16, etc.

Question: Do you receive that gift In spite of what you have or will ever do, or because of things you have done or will do?

Thought: If its in spite of what you have or will ever do, but then you can lose it because of something you have done then is it a gift? If you have to do something to "prove you have it" is it still a gift?