Free will is "corrupted nature's deformed darling, the Pallas or beloved self-conception of darkened minds"

A natural man hath no such thing as free-will at all, if you take it for a power of doing that which is good and well-pleasing unto God in things spiritual.

The vigour, and power, and comfort of our spiritual life depends on the mortification of the deeds of the flesh...The choicest believers, who are assuredly freed from the condemning power of sin, ought yet to make it their business all their days to mortify the indwelling power of sin...Do you mortify; do you make it your daily work; be always at it whilst you live; cease not a day from this work; be killing sin or it will be killing you.

Great winds and storms help fruit-bearing trees. So also do corruptions and temptations help the fruitfulness of grace and holiness. The storm loosens the earth round its roots so the tree is able to get its roots deeper into the earth, where it receives fresh supplies of nourishment. But only much later will it be seen to bring forth better fruit. So corruptions and temptations develop the roots of humility, self-abasement and mourning in a deeper search for that grace by which holiness grows strong. But only later will there be visible fruits of increased holiness.

Many there are who, not comprehending, not being affected with, that divine, spiritual description of the person of Christ which is given us by the Holy Ghost in the Scripture, do feign unto themselves false representations of him by images and pictures, so as to excite carnal and corrupt affections in their minds. By the help of their outward senses, they reflect on their imaginations the shape of a human body, cast into postures and circumstances dolorous or triumphant; and so, by the working of their fancy, raise a commotion of mind in themselves, which they suppose to be love unto Christ.

No wonder if such persons look upon imputed righteousness as the shadow of a dream, who esteem those things which evidence its necessity to be but fond imaginations. And small hope is there to bring such men to value the righteousness of Christ, as imputed to them, who are so unacquainted with their own unrighteousness inherent in them. Until men know themselves better, they will care very little to know Christ at all.

He that hath slight thoughts of sin, never had great thoughts of God.