He replies that his life will remain the same even with the offer of a new job.
Explanation:
The Mersault chief offers him a place in the office that will open in Paris. This is a unique opportunity in life and would be a great professional step, which would allow a major change in Mersault's life, allowing him to gain unimaginable experiences.
However, Mersault is a person with very little ambition and vitality for the opportunities that are given to him and for that reason, he says that his life will not change at all and that he will remain the same, even if he goes to Paris.
