This is τούτου in its specific neuter singular genitive function, meaning 'of this thing' or 'from this.' While the form was identical to the masculine genitive, context determined whether it referred to masculine persons or neuter concepts. In neuter usage it often appeared in phrases indicating source ('from this'), cause ('because of this'), or partitive relationships ('part of this'). Biblical writers used it in theological statements about the source of grace, the reason for judgment, or the nature of spiritual realities. The neuter genitive was particularly important for abstract reasoning and explanatory statements that characterized New Testament epistles.