In your own words, what is the main idea expressed in the essay?, assignment help

Suppose I think about my future course of action. It might seem
like I have have several choices before me (I could have soup for
dinner or I could have a sandwich), but it strikes me that this is just
an illusion. This is because humans are just like any other material
entity found in the world, and hence subject to restrictive causal laws.
If I jump out of a plane, gravity must pull me down (and this is
unavoidable). If I have a release of serotonin in my brain, I will feel
happy (and this too is unavoidable). What I eat for dinner is explained
in a similar way, even if it is more complicated. Given my preferences
and my desires and the relevant psychological laws, I will be compelled
to pick the soup for dinner (as one example). I really couldnt have
chosen otherwise. So, I must not have free will.

Questions:

1) In your own words, what is the main idea expressed in the essay?

2)
Would this make any difference in how you viewed any past decision that
you have made? (Describe a past decision and give reasons for your
answer.)