Who says, "The only way you'll see the inside of a spaceship is if you were cleaning it?"

The quote "The only way you'll see the inside of a spaceship is if you were cleaning it" is spoken by Anton, who is Vincent's brother. This line reflects the themes of the film regarding genetic identity and societal expectations. In GATTACA, society is stratified based on genetic engineering, with individuals like Anton being genetically superior and afforded opportunities that those deemed "in-valid" like Vincent can only dream of achieving.

Anton expresses a harsh reality to Vincent, emphasizing the barriers and biases present in their world. The context of this quote is significant; it conveys the idea of fate and the limitations imposed on those whose DNA does not meet the standards of the privileged class. Anton's character serves as a representation of the societal pressures that dictate not only personal relationships but also the architecture of success and opportunity within the genetically-engineered society.