Ilardi has written and/or edited more than 40 books, including:
- “The Book of the Rose”
- “The Last Dance”
- “The House the Universe Built”
- “To the River: 100 Love Poems”
- “The Love That Kills”
- “The Dreams of William Blake: A Poet’s Quest for Truth”
- “The Prophecy: A Divine Comedy of the Soul”
- “All That Love Is”
- “Dante’s Divine Comedy: A Reader’s Guide”
- “In His Own Divine Image”
- “Divine Love, Human Love: Toward the Integration of Eros and Agape”
- “The God That Breathes: A Divine Comedy”
- “Meditations on the Tarot: A Journey into Christian Hermeticism”
- “God’s Imaginings”
- “Jesus: The Last Mystic”
- “In This Grace”
- “The Dance of the Spirit”
- “From Darkness into Light”
- “The Heart’s Fire: A Poet’s Memoir of Love and Poetry”
- “From the Other Shore”
- “Through the Valley of Fire: A Poem of Divine Union”
- “The Heart Is an Island”
- “The Bride and the Beast”
- “Sacred Love: Uniting Mystical and Erotic Energies”
- “The Soul’s Journey: A Map for the Modern Pilgrim”
- “On the Wings of Grace”
- “All That Is: In Search of the One Love”
- “The Great Divorce: Dante’s Divine Comedy and the Modern Loss of Vision”
- “Mysticism and Sexuality: A History of the Spiritual Dimension of Love”
- “A Light in the Dark”
- “Through the Darkness”
- “When Night Descends”
- “The Dark Night of the Soul”
- “Into the Depths”
- “The Abyss”
- “Into the Light”
- “In Divine Union”
- “All Is Grace”