Here is a quote Thune lifted from G.K. Chesterton on this topic of assurance, confidence, pride and prejudice:
What we suffer from today is humility in the wrong place. Modesty has moved from the organ of ambition [and] settled upon the organ of conviction, where it was never meant to be. A man was meant to be doubtful about himself, but undoubting about the truth; this has been exactly reversed… The old humility was a spur that prevented a man from stopping; not a nail in his boot that prevented him from going on. For the old humility made a man doubtful about his efforts,which might make him work harder. But the new humility makes a man doubtful about his aims,which will make him stop working altogether.
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It’s not long and will encourage your heart toward confidence in Christ and the gifts He has given you for your good, His glory, the church’s benefit and a witness to the world.