I work a lot but don't seem to finish. That is, I hope what I am doing means something because I don't know what I am doing. It's strange and terribl… - Umberto Boccioni

..the moving whirlwind of modernity through its crowds, its cars, its telegraph poles, its bare, working-class neighbourhoods, its noises, its squeals, its violence, its cruelty, its cynicism, and its relentless pushiness.

The commitment I have made is terrible and the plastic means appear and disappear at the moment of implementation. It's terrible.. .And the chaos of will? What law? It’s terrible.. .Then I struggle with sculpture: I work, work and work and I don't know what I give. Is it interior? Is it exterior? Is it sensation? Is it delirium? Is it brain? Analysis? Synthesis? I don't know what the f... it is! Forms on forms.. confusion.. .The Cubists are wrong. Picasso is wrong. The academics are wrong. We're all a bunch of d..heads.

Original text:
Agli artisti giovani d'Italia!
Il grido di ribellione che noi lanciamo, associando i nostri ideali a quelli dei poeti futuristi, non parte già da una chiesuola estetica, ma esprime il violento desiderio che ribolle oggi nelle vene di ogni artista creatore.