"Let patience have its perfect work, that you may be perfect and complete, lacking nothing" James 1:4
Chambers talks about areas in a Christian's life where we get careless and lazy. He says it's not sin, but remnants of our carnal life that tend to make us careless.
God will allow nothing to escape His notice, and will endlessly bring us back to Him when we stray.
Chambers also warns to beware of becoming careless over the small details of life and saying, "Oh that will have to do for now".
One thing that drives me nuts is the attitude of "it's good enough for church!". Why can't we give our best to God, in all areas of our lives? Instead of doing something half hearted, do the best we can.