This study examines the servant leadership of Jesus Christ as a model for Christian educators in an effort to realize social harmony towards 2045. Using a qualitative method involving literature analysis and in-depth interviews with a number of Christian educators, this study aims to explore the understanding and application of servant leadership principles in an educational context. The main focus of this research is to explore the values that Jesus taught, such as unconditional love, empathy, collaboration, and humility, and how these values can be applied in an educational setting. The research also analyzes the impact of applying these principles on the formation of students' socially sensitive characters and their ability to contribute positively to society. The results are expected to provide practical recommendations for Christian educators in creating an inclusive, safe and supportive learning environment. By forming students who are not only academically smart, but also have social awareness, it is hoped that they can become agents of change who bring positive impact in facing social challenges in the future. Through the application of Jesus' servant leadership, this research seeks to demonstrate the relevance of Christian values in creating a harmonious and equitable society in Indonesia in 2045.

Holiness is the key to salvation in Christianity because salvation is the main goal in Christianity, but in achieving salvation it takes holiness of life as the key for someone to be saved as written in the book of Hebrews 14: 12 that without holiness no one will see God. The writing of this article uses a descriptive qualitative approach using the literature study method which is carried out by collecting various writings, both contained in print media, theses, articles, journals, papers, and others that are relevant to the material discussed in this article. in achieving holiness, a process is needed in achieving it, so one of the steps in achieving holiness is to control the tongue because the Bible notes that who can control his tongue is perfect, the conclusion is that by practicing controlling our tongue / words every day will help us achieve holiness by keeping the tongue from being used to say things related to sin.