The human capacity to sin and the location of evil are considered in James in light of ongoing research within the field of Qumran studies. This essay consists of two main parts. First, the association of ‘desire’ in Jas 1.14–15 with the Jewish concept of yēṣer is revisited by drawing upon occurrences of yēṣer from Cave 4 that had previously not been included in the assessment of James. Parallels from, especially, 4QInstruction provide new data suggesting that sapiential tradition may also reflect the apocalyptic view that human evil is provoked by spiritual beings, vis-à-vis an evil yēṣer, which opens up a more nuanced understanding of the self and how ‘desire’ may operate in Jas 1.14–15. Second, after arguing that the human capacity to sin cannot be relegated merely to a negative anthropology, the larger issue of evil beings (i.e. devil, demons) within James’ cosmology is considered. In conclusion, James’ sapiential discourse is seen to be located within a cosmological framework which includes active evil agents who lead human beings astray and cause suffering and death. Human responses to evil in James include petitioning God and asking for wisdom from above.