Track down an electronic copy of Calvin's "Institutes...." and do a word search of "free will." You'll find he uses the phrase more than 150 times.
The Westminster Confession of Faith states,
CHAPTER 9
Of Free Will
- God hath endued the will of man with that natural liberty, that is neither forced, nor by any absolute necessity of nature determined to good or evil.
- Man, in his state of innocency, had freedom and power to will and to do that which is good and well-pleasing to God; but yet mutably, so that he might fall from it.
- Man, by his fall into a state of sin, hath wholly lost all ability of will to any spiritual good accompanying salvation; so as a natural man, being altogether averse from that good, and dead in sin, is not able, by his own strength, to convert himself, or to prepare himself thereunto.
- When God converts a sinner and translates Him into the state of grace, He freeth him from his natural bondage under sin, and, by His grace alone, enables him freely to will and to do that which is spiritually good; yet so as that, by reason of his remaining corruption, he doth not perfectly, nor only, will that which is good, but doth also will that which is evil.
- The will of man is made perfectly and immutably free to good alone, in the state of glory only."
God humans with a "natural liberty." It is not forced to be good or evil. The freedom and power to do good and please God existed but was liable to change. Once changed into the state of sin any previous liberty to will any spiritual good
accompanying salvation was lost, and humans in that state cannot in their own might change that condition. God frees the sinner from that bondage, enabling the creature to once again to choose and do that which is spiritually good, but he remains imperfect on this side of the grave and only in resurrection is s/he incorruptible, perfectly and immutably free.
That the chief doctrinal statement to which we adhere.