Sacrifice of thanksgiving--a leaven for grace - psalm50

Ps50:14 "sacrifice of thanksgiving" Brian Houston preached a best message of the year this past Sunday, which he talked about two different kinds of leaven. Which leaven you have leads to what kind of a lump you are. I think ps 50 actually explains about these two leavens, one's our offerings by law, which leads to self righteousness, the other one's sacrifice of thanksgiving, which leads to a whole new realm of grace and blessings.