Good and short explanation, congratulations. I think that there is a huge paradox in this issue.

1. If our will is determined by reasons in an absolutely necessary way, we are not free.
2. If our will is not determined by reasons, our will is random, therefore we are not free.

It seems that we are doomed, or we should re-think how could we conceive our freedom in a way that allows us to avoid this uncomfortable paradoxes.