Charles H. Spurgeon on Psalms 106:34

They did not destroy the nations, concerning whom the LORD commanded them. They were commissioned to act as executioners upon races condemned for their unnatural crimes, and through sloth, cowardice, or Sinful complacency they sheathed the sword too soon, very much to their own danger and disquietude. It is a great evil with professors that they are not zealous for the total destruction of all sin within and without. We make alliances of peace where we ought to proclaim war to the knife; we plead our constitutional temperament, our previous habits, the necessity of our circumstances, or some other evil excuse as an apology for being content with a very partial sanctification, if indeed it be sanctification at all. We are slow also to rebuke sin in others, and are ready to spare respectable sins, which like Agag walk with mincing steps. The measure of our destruction of sin is not to be our inclination, or the habit of others, but the Lord's command. We have no warrant for dealing leniently with any sin, be it what it may.