“Jesus says that the root of anxiety is inadequate faith in our Father’s future grace.  As unbelief gets the upper hand in our hearts, one of the effects is anxiety.  The root cause of anxiety is a failure to trust all that God has promised to be for us in Jesus.”  (page 25, see Matthew 6:25-34)

“The itch of self-regard craves the scratch of self-approval.” (page 49)

“You must think that your protection hangs on you.  And even though you are not sure that your own resources will take care of you, yet you opt for fragile self-reliance, rather than faith in future grace.”  (page 52)

“Because pride does not like to admit that it has anxieties.  And if pride has to admit it, it still does not like to admit that the remedy might be trusting someone else who is wiser and stronger.”  (page 53)

“The opposite of impatience is not a glib denial of loss.  It’s a deepening, ripening place of obedience, and to walk with God at the unplanned pace of obedience-to wait in his place and go at his pace.”  (page 71)

“Patience is an evidence of inner strength.  Impatient people are weak, and therefore dependent on external supports-like schedules that go just right and circumstances that support their fragile hearts.”  (page 74)

Battling Unbelief by John Piper (page 49)