Poetry Collections:
* The City (1975)
* The Gate (1978)
* The Land (1981)
* The River (1983)
* The Sun (1985)
* The Moon (1988)
* The Stars (1991)
* The Wind (1994)
* The Fire (1997)
* The Sea (2000)
* The Earth (2003)
* The Sky (2006)
* The Time (2009)
* The Love (2012)
* The Life (2015)
Novels:
* The Last Day of the World (1989)
* The Return of the Gods (1992)
* The Death of the Sun (1995)
* The Birth of the Moon (1998)
* The End of the Universe (2001)
* The Beginning of Time (2004)
* The Mystery of the Universe (2007)
* The Secret of Life (2010)
* The Meaning of Existence (2013)
* The Purpose of Life (2016)
Plays:
* The Last Supper (1987)
* The Judgment Day (1990)
* The Apocalypse (1993)
* The Resurrection (1996)
* The Second Coming (1999)
* The End of Days (2002)
Essays:
* On the Nature of Reality (1985)
* The Meaning of Life (1988)
* The Purpose of Existence (1991)
* The Secret of the Universe (1994)
* The Mystery of Life (1997)
* The End of History (2000)
* The Future of Humanity (2003)
This is not an exhaustive list, but it gives you an idea of the breadth of his work. Millers is a prolific writer whose work has been translated into numerous languages. He is considered one of the most important Latvian writers of the 20th and 21st centuries.