What role did humanism play in Italian High Renaissance art?

Before the Renaissance, most art was created anonymously to glorify God. Artists did not do self-portraits or sign their work, so they remained unknown. During the Renaissance, some artists even placed themselves in the work they created. They began to sign their works and create self-portraits. The content of the art changed from mostly religious figures to everyday figures, such as marines, wives, children, scholars, or musicians.