C.S. Lewis once wrote to a friend,
“The trouble with me is lack of faith . I have no rational ground for going back on the arguments that convinced me of God’s existence: but the irrational deadweight of my own skeptical habits, and the spirit of this age, and the care of the day, steal away all my lively feeling of the truth, and often when I pray I wonder if I am not posting letters to a non-existent address. Mind you I don’t think so – the whole of my reasonable mind is convinced: but I often feel so .”
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Letters to Arthur Greeves, Dec. 24, 1930, 398-399