in the new testament, what type of biblical text can the writings of st paul be defined as?

In the New Testament, the writings of St Paul are defined as epistles , that is, letters.

What “epistle” means

An epistle is a formal written letter, usually addressed to a person or community, and intended to teach, exhort, or correct.

Paul’s writings fit this exactly: they are letters sent to early Christian churches or individuals, dealing with doctrine, moral guidance, and practical church issues.

Paul’s letters in the New Testament

In the New Testament these are commonly called the Pauline epistles (or Letters of Paul).

They are a distinct group of books, different from the Gospels (narratives) and Acts (historical narrative), because they are mainly correspondence rather than story.

Their role as biblical text

Paul’s epistles are treated as authoritative, theological letters that explain the meaning of Christ’s death and resurrection and how Christians should live in response.

For this reason, they are both pastoral letters to specific communities and foundational doctrinal texts within the Christian canon.