One of the primary reasons for the division in the church over free grace and free will is the failure of one side to distinguish between law and gospel. Most synergists erroneously reason (outside of Scripture) that if something is commanded in Scripture then man must, therefore, have the moral ability to do it. Instead, after the fall, the Bible uses the holy commands as an instrument of God to strip man of all hope in himself and behold his own moral bankruptcy (Rom 3:19, 20).
"The commandments are not given inappropriately or pointlessly; but in order that through them the proud, blind man may learn the plague of his impotence, should he try to do as he is commanded." Martin Luther, Bondage of the Will, pg. 160
"By the law is the knowledge of sin' [Rom 3:20], so the word of grace comes only to those who are distressed by a sense of sin and tempted to despair." Martin Luther, Bondage of the Will, pg. 168
All the commands of our Lord were given to us to obey. We cannot twist Scripture to somehow ignore the weight of the responsibility this puts on each one of us. Grace does not somehow give us a trump card to ignore the commands. No, we appeal to grace, not in order to cancel out, avoid or do away with God's commands. On the contrary, we appeal to the grace of God in Christ in order that we might have the strength and power to do them. For apart from grace we can do nothing (John 15:5, 3:27, 6:63; 1 Cor. 4:7, 15:10; 2 Tim 2:25) If God commands us to love him with all our heart how do we do this? By grace. If God calls us to love our neighbor, how to we do this? By grace. If God summons us to believe the gospel, how do we do this? By grace. This is the message found on every page of the bible.