Psalms 51:12 - Wesley's Explanatory Notes

The joy — The comfortable sense of thy saving grace, promised and vouchsafed to me, both for my present and everlasting salvation. Free — Or, ingenuous, or liberal, or princely. Which he seems to oppose to his own base and illiberal and disingenuous and servile spirit, which he had discovered in his wicked practices: a spirit, which may free me from the bondage of sin, and enable me chearfully to run the way of God's precepts.