Here are some convenient links to translations of John Paul I’s writings (mostly from Lori Pieper’s website). Some are in the book A Passionate Adventure, but there are a number of others as well.
The Last Audience on Love (video with subtitles)
For the Jubilee of Mercy
The Mercy of God Explained by Albino Luciani (article by Andrea Tornielli)
St. Leopold Mandić and God’s Mercy (Luciani writes about a great modern confessor)
God as Father and Mother (An exposition of this theme in his life and writings)