Alexis de Tocqueville: Democracy in America–the chapters on Pantheism and Religion
Ortega y Gassett: The Revolt of the Masses, especially his section on cynicism and “the spoiled child of history.”
Joseph Ratzinger: The essay I quoted was “To Change or Preserve” in Values in a Time of Upheaval but the whole collection is excellent. This book is worth 10x the price you will pay for it.
Benedict XVI Regensburg Address on the crisis of reason in the west.
Theodore Dalrymple: Spoilt Rotten: The Toxic Cult of Sentimentality and here is a link to the Theodore Dalrymple short essay on how beauty repels banality and mediocrity. This is the one where the store owners played Bach to drive away hooligans. Fascinating.
I also highly recommend the New Criterion. It is perhaps my favorite magazine. One of the questions toward the end of Q&A was how to think seriously about art criticism. The New Criterion, founded by Hilton Kramer and now run by Roger Kimball is a good start.
And of course, if you haven’t already read it, The Abolition of Man by Lewis is indispensable.
There may have been more. If you remember, please add them in the comments. Thanks