They have written some of the most passionate, inspiring and beautiful works I have ever seen. Here are two that I keep bookmarked:
http://www.vatican.va/holy_father/paul_vi/encyclicals/documents/hf_p-vi_enc_25071968_humanae-vitae_en.html
http://www.vatican.va/holy_father/benedict_xvi/encyclicals/documents/hf_ben-xvi_enc_20051225_deus-caritas-est_en.html
The often breathtakingly articulate writings of the Holy Fathers, must be divinely inspired.
Thanks.