Evidently God is looking for something more from us than doing good–he wants absolute, pure, undefiled, transparent people–transparent motives.  Impossible you say?  Not with God–this is what Oswald Chambers has to say about it:

Motives–the source from which we do everything.

No one can make himself pure by obeying laws.  Jesus Christ does not give us rules and regulations–He gives us His teachings which are truths that can only be interpreted by His nature which He places within us.  The great wonder of Jesus Christ’s salvation is that He changes our heredity.  He does not change human nature–He changes its source, and thereby its motives as well.