Lewis selection of genres for different purposes and audiences

• Fictitious Letters: Screwtape Letters, Letters to Malcolm Chiefly on Prayer
• Radio Talks: The Case for Christianity, Mere Christianity
• Polemic, Scholarly Arguments: Miracles, The Problem of Pain
• Devotional Meditations: Reflections on the Psalms
• Sermons: The Weight of Glory and Other Addresses

• Lectures: The Abolition of Man, "The Inner Ring"
• Short Articles: "On Vivisection," "We Have No Right to Happiness"

• Scholarly Books: The Allegory of Love, An Experiment in Criticism
• Lectures which became books: The Discarded Image, Preface to Paradise Lost
• Scholarly Articles: "The Personal Heresy"

• Children's Fantasy Books: The Chronicles of Narnia
• Science Fiction Fantasy: The Space Trilogy
• Dream Vision: The Great Divorce

• A Journal/Diary: A Grief Observed
• Poetry: "The Apologist's Evening Prayer"
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  THE APOLOGIST'S EVENING PRAYER
  
  From all my lame defeats and oh! much more
  From all the victories that I seemed to score;
  From cleverness shot forth on Thy behalf
  At which, while angels weep, the audience laugh:
  From all my proofs of Thy divinity,
  Thou, who wouldst give no sign, deliver me.
  
  Thoughts are but coins. Let me not trust, instead
  Of Thee, their thin-worn image of Thy head.
  From all my thoughts, even from my thoughts of Thee,
  O thou fair Silence, fall, and set me free.
  Lord of the narrow gate and the needle's eye,
  Take from me all my trumpery lest I die.