Paul is addressing the believers, emphasizing that the gospel he preaches is not something he invented or received from other people. Instead, it is a revelation from God. This is crucial because it establishes the divine authority and authenticity of the message. Paul wants the Galatians to understand that the teachings they are following are not based on human ideas or traditions, but on a direct revelation from God. This assurance is meant to strengthen their faith and confidence in the gospel's truth.
By asserting that the gospel is not of human origin, Paul is also defending his apostleship and the legitimacy of his mission. He wants to make it clear that his teachings are not influenced by human agendas or philosophies, but are rooted in divine truth. This distinction is important for the early church, as it faced various challenges and teachings that could potentially lead believers astray. Paul's message encourages Christians to hold fast to the gospel, trusting in its divine source and the transformative power it holds for their lives.