After a century of neglect, Johannine ethics has enjoyed a recent surge in interest inspired by new theoretical insights in analysing ethical data in John's Gospel. By closely re-reading the text on the basis of this fresh research, Jan G. van der Watt's aim in the present volume is to reveal ethical data within its structural interrelatedness. The result is a comprehensive overview of basic questions related to ethics, such as what the basis or source of ethics actually is, whether identity plays a role in ethical decision making, how values and ethical requirements are to be recognised, what is expected of an ethical agent, and what ethical behaviour looks like. As a coherent guide to getting deeds done ethically, this first volume on the grammar of the apostle's ethics focuses on his Gospel, while a second is set to concentrate on his letters.