Man, in his state of innocence, had freedom and power to will and to do that which was good and well-pleasing to God, but he was mutable [= changeable, variable, fickle], so that he might fall from this condition.
Man, by his fall into a state of sin, has completely lost all ability of will to perform any of the spiritual good which accompanies salvation. As a natural man, he is altogether averse to spiritual good, and dead in sin. He is not able by his own strength to convert himself, or to prepare himself for conversion.
When God converts a sinner, and translates him into a state of grace, he frees him from his natural bondage to sin, and by grace alone he enables him freely to will and to do that which is spiritually good. But because of his remaining corruptions he does not only (or perfectly) will that which is good, but also wills that which is evil.
This will of man will only be made perfectly and immutably free to will good alone in the state of glory.
God has endued the will of man, by nature, with liberty and the power to choose and to act upon his choice. This free will is neither forced, nor destined by any necessity of nature to do good or evil.