In an interview posted on The Telegraph (14 Oct 2011), Martin Amis shared with Edmundo Paz Soldán, the Bolivian novelist and professor, that novelists are the "freest of all artists", because, unlike a painter, a novelist isn't "confined by a square on the wall", unlike a musician, an artist isn't confined to "musical scales", unlike a poet, a novelist isn't confined to "the disciplines of verse", and, unlike a filmmaker, a novelist doesn't "have actors; producers; money pressures of any kind." Amis said,
The process of writing a novel [...] is intoxicating. You can do absolutely anything; you are the freest of all artists. You’re not confined by a square on the wall or musical scales or the disciplines of verse, and you’re certainly freer than a film-maker who is dependent on the weather when he goes out to make his world. And it’s completely uncollaborative – you don’t have actors; producers; money pressures of any kind.
I'll reiterate that novelists, or writers in general, should not have "money pressures of any kind", because a writer should not write for money but he or she should write about a passionate topic, which will, consequently, help a writer maintain a sufficient level of motivation and inspiration, which is needed, because like Willie shared with Lesser in The Tenants (2005), "Man, I tell you, this writing stuff is no joke." "Baby, it's a long, hard, lonely life."