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This study contributes to the understanding of how first century Christ-believers, particularly those who shared the imagination of Ephesians, experienced the relation between their social identity as Christ-believers and behavior norms. In order to understand this, a number of theories from the cognitive sciences are used in combination with historical-critical methods. After a theoretical survey of relevant cognitive theories and discussions about the epistemological problems of using cognitive theories on historical texts, the theories are used to understand (a) how Ephesians imagines the relation between identity and behavior norms and (b) the potential group dynamic effects of this imagination. The result is a demonstration of how Ephesians is able to create a coherent narrative, beginning with God's agency and ending with behavior (norms), and facilitating psychological and group dynamic effects such as intergroup distinction, self-esteem, cognitive certainty and consensus among group members, intragroup cooperation, moral judgment and inclusion/marginalization, motivation to remain committed and, last but not least, a sense of capacity and obligation to act morally.

This study traces Jesus' attitude to impurity within the historical context at the end of the Second Temple period, when practices of ritual purity came to play an increasing role in Jewish society and an expansionist trend gained in influence and support. The traditional focus on sayings material and criteria of authenticity in historical Jesus-research is modified, narrative traditions with implicit purity issues are appealed to, and extra-canonical traditions are included. The main areas examined are the most important "fathers" of impurity: "leprosy" (skin diseases), genital discharges, and corpse-contamination. Jesus is found to have acted in ways that could have been understood by some of his contemporaries as indifference to these types of impurity. His behaviour is shown on several points to clash with current purity halakhah and dominant expansionist ideals. In an attempt to interpret his actions within the Jewish context and culture of the Second Temple period, three explanatory models are provided. Jesus' attitude can be seen as part of a moral trajectory in Judaism. It can be understood as a response to a regional, Galilean dilemma. It can be viewed in a power perspective as an expression of Jesus' eschatological struggle against demonic evil. The result is that Jesus may be understood as operating within the purity paradigm of his time, yet seemingly indifferent in the eyes of some, pushing it to the breaking point. Such a reconstruction makes subsequent developments intelligible, in which various Christian currents drew conflicting conclusions. Those looking to Jesus' behaviour for some sort of guidance today may perhaps find contemporary analogies.

While Jesus and Purity (2002, corrected reprint 2010, 2021) aimed to present an unfolding argument, this volume does not aspire at such coherence. It consists of articles and papers on various issues of impurity in early Judaism. A few of these have been previously published, the rest not. Some chapters develop and further expand on topics discussed in Jesus and Purity and much focus lies on questions of the impurity of discharges and the practice of hand-washing before meals. Both literary and historical methods are used, as well as approaches based on cognitive science. The analysis covers texts from the Pentateuch, Qumran, the New Testament, and some Jewish Hellenistic authors. By bringing these articles together, they are made available and can be easily found by potential readers. Together with the recently published collection Impurity and Purification in Early Judaism and the Jesus Tradition (SBL Press, 2021), Issues of Impurity represents Kazen's continuous work on purity issues through two decades. The reader of both volumes will see how the author's views have gradually evolved through the years.