The word Freewill must stand for a reality.

Thou usest the word 'Freewill,' learn its independence from the word ; thou usest the word 'Slavery,' learn the bondage (of slavery) from the word; thou usest the word 'Nature,' recognize its immutable fixity by the word ; and thou speakest of 'God,' recognize His actual Existence by the word. For all these are words which are not at variance with their (underlying) realities. If thou namest these things when thou wishest, thou must of necessity acknowledge them to thyself even if [xx] thou dost not wish. Speak against Freewill, and in virtue of what it is we can know how powerful Freewill is, since it has struggled with its power against its power. [Ov. p. 47.] For even when a man says that there is no Freewill, he is able to say there is no Freewill because he has Freewill; and, therefore, in proportion as that Freewill artfully changes itself in various ways, so those changes tell us that Freewill exists. For a 'bound Nature' cannot be changed. Why then is it necessary for us to obtain from another direction testimony as to whether Freewill exists or not ? For, behold, in virtue of being what it is, the evidence for it is proclaimed. For when it denies itself, (saying) that it is not independent, it is convicted of not being in bondage. For when any one acknowledges that Freewill exists, it is not right that Necessity should come near it.