When we seek God's grace we certainly do so to be freed from sins and faults. However that is only a “dividend” of grace. Grace liberates us for something. Grace makes something that is good, better. Our human nature is good. Grace raises us above human nature so that God's love can enter us more fully. After the offer of grace there is no middle ground. We either move in the direction of freedom and love or we deteriorate under the slavery of our sins and faults.
Though human nature is good, in the modern world nature has been so glorified that there has been a loss of belief in the supernatural. The naturally good person may indeed produce good works. However it is quite likely that the naturally good person will not remain naturally good. In any case, the good works are limited by the limited vision and power of human nature. Jesus' goal is to lead his disciples toward a life that is both fully human and divine.
Lord, you call me to become like you with a heart of flesh and the spirit of God. Heal what is wounded in my nature and give me grace to live a new and divine kind of life in you, free and loving.