Answer:
Discourse, which has to do with talk, words, language, etc have a very huge impact on a person's culture and identity.
First of all, what is culture? Culture can be described as the way of life of a group of people
Identity is the totality of a person's being or it can also be defined as the qualities or beliefs that make a group.
Therefore, the way a person talks and the language he uses (discourse) influences his identity and culture because it is a major tool for communication and it is a unifying factor.