If you think about that statement you will realize it is self-contradictory.
Either we have free will or we are controlled by another. These are mutually exclusive things.
The Scriptures both "old" and "new" are filled with words like "choose," "repent," "trust," "obey," "believe"--all these indicate personal free choice and decision-making--the human will.
Every moment of every day we are making choices based upon what we have already heard and already believed. This belief system becomes evident to those who observe us in the actions they see us taking. There are some who think they make no choice by refusing to do or say a thing; I contend with Scripture that the "not doing" is also a choice and a decision, demonstrating a belief system that is already in place and at work.
I believe you are seeking these things out.
Here is a very simple metaphor that occurs to me:
If you love someone, let them go; if they come back to you then the love is complete.
For love is not a thing to be coerced.
OK, I'll re-phrase it by saying He controls what we believe is our free-will.
How do you know that we could have made different choices? I'm sure you believe it, but you will never truly know it.