Luther: It is more important to guard against good works than against sin

The following is from the web page Luther, Exposing the Myth, under the heading "Faith and Good Works":

“It is more important to guard against good works than against sin” [Trischreden, Wittenberg Edition, Vol. VI., p. 160].

Luther Exposing the Myth says their stated purpose is to show that "from Luther’s own words we shall see him for what he really was, that is a rebellious apostate, who abandoned the faith and led many into apostasy from God under the guise of “reformation” in order to follow his perverse inclinations." With this quote, they attempt to show Christ valued works as part of salvation, while Luther said "It is more important to guard against good works than against sin."

Documentation
Luther Exposing the Myth cites "Trischreden, Wittenberg Edition, Vol. VI., p. 160." There is no such thing as "Trischreden," it's Tischreden. The Tischreden is Luther's Table Talk, a collection of second hand comments written down by Luther's friends, published after his death. The Wittenberg Edition is an early collection of Luther's works (1539-59). It contains 12 German and 8 Latin volumes. The material was topical, at the request of Luther. This volume contains some of the writings of Luther's opponents as well. LW 54 points out though, "Early editions of the works of Martin Luther did not include the Table Talk. It was with some misgivings that Johann Georg Walch finally decided to incorporate the Table Talk in his edition, which was published in twenty-four volumes in Halle between 1739 and 1753." Therefore, the documentation is questionable. The Wittenberg Edition did not include the Table Talk.

The possibility that the author of Luther Exposing the Myth actually had access to the Wittenberg Edition to extract this quote? Slim, if not nil. The quote was probably taken from this source. The quote is also found in Patrick O'Hare's Facts About Luther. O'Hare cites the Wittenberg edition as well. The quote probably is in vol. 6 on page 160. The actual writing this quote comes from is Eyn Sermon von dem newen Testament. das ist von der heyligeµMesse (WA 6, 353–378), or Sermon on the Mass, currently found in LW 35 as "A Treatise on the New Testament, That is, The Holy Mass"(1520). LW 35 points out, "By 1524, fourteen editions had appeared in various cities. Because of its fundamental importance this treatise has found a place in all major collections of Luther’s works."

Context
In the later part of this treatise, Luther explains his rejection of the Roman teaching on the mass as a sacrifice and good work. For Luther, the mass expressed God's words of promise to be grasped by faith. Luther says,

It must necessarily follow where faith and the word or promise of God decline or are neglected, that in their place there arise works and a false, presumptuous trust in them. For where there is no promise of God there is no faith. Where there is no faith, there everyone presumptuously undertakes to better himself and make himself well pleasing to God by means of works. Where this happens, false security and presumption arise, as though man were pleasing to God because of his own works. Where it does not happen, the conscience has no rest and knows not what to do in order to become well pleasing to God.

So too, I fear that many have made the mass into a good work, whereby they have thought to do a great service to Almighty God. Now if we have properly understood what has been said above, namely, that the mass is nothing else than a testament and sacrament in which God makes a pledge to us and gives us grace and mercy, I think it is not fitting that we should make a good work or merit out of it. For a testament is not beneficium acceptum, sed datum; it does not take benefit from us, but brings benefit to us. Who has ever heard that he who receives an inheritance has done a good work? He simply takes for himself a benefit. Likewise in the mass we give nothing to Christ, but only receive from him; unless they are willing to call this a good work, that a person sits still and permits himself to be benefited, given food and drink, clothed and healed, helped and redeemed. Just as in baptism, in which there is also a divine testament and sacrament, no one gives God anything or does him a service, but instead takes something, so it is in all other sacraments and in the sermon as well. For if one sacrament cannot be a meritorious good work, then no other can be a work either, since the sacraments are all of one kind, and it is the nature of a sacrament or testament that it is not a work but only an exercise of faith [LW 35:92-93].

Luther goes on to discuss the abuse of works in regard to the mass. He concludes the entire treatise by stating the quote in question:

Therefore let us beware of sins, but much more of laws and good works, giving heed only to the divine promise and to faith. Then all good works will come of themselves. To this may God help us. Amen [LW 35:111].

Conclusion
See what happens when only half a sentence is quoted? Luther exhorts his readers to beware of sin, but to guard against negating God's promises by seeking to be justified by works. If one embraces Christ by faith (a saving faith), Luther concludes, " Then all good works will come of themselves." Indeed, in context one should guard against good works as a means of justification. For Luther, good works have their place and value. Had Luther Exposing the Myth quoted the entire sentence, such a blatant misrepresentation of a historical document could have been avoided.