Another major topic of Romeo and Juliet is fate: the belief that an individual's life has been decided for them and there is nothing they can do to change it. This is used right from the start. Romeo and Juliet's ill-fated lives are described as 'death-marked', and they are a 'pair of star-crossed lovers'. The idea of fate works on several levels. Shakespeare sets the two families against each other, and there is nothing Romeo and Juliet can do about this.
The couple have a feeling that things will go badly for them. Romeo thinks something is 'hanging in the stars', while Juliet says a 'faint cold fear thrills through my veins'. This is far more mysterious for us. In Shakespeare's time, fate was taken very seriously. An audience would have appreciated what he meant by all these references.