Full Idea
It is our feeling of having more force that we call 'freedom of will', the consciousness of our force compelling in relation to a force that is compelled.
Gist of Idea
'Freedom of will' is the feeling of having a dominating force
Source
Friedrich Nietzsche (Writings from Late Notebooks [1887], 34[250])
Book Reference
Nietzsche,Friedrich: 'Writings from the Late Notebooks', ed/tr. Bittner,Rüdiger [CUP 2003], p.16
A Reaction
I don't agree. That describes well how we experience the will, and develop the concept of a will, but the idea that the will is 'free' seems to me to be totally theoretical (and false), and doesn't derive from experience at all.