Shared ground
Jesus describes a clear sequence: he gave the disciples the Father’s “word,” and that gift marked them out so that “the world” hated them (vv. 14, 16). The disciples remain in the world, but they do not belong to it in the way the world expects (vv. 15–16). Jesus prays not for their removal but for their protection “from the evil one” (v. 15). He also prays that they be “sanctified” (set apart) in “truth,” and he identifies the Father’s word as truth (v. 17). Finally, he frames their mission as a continuation of his own sending: the Father sent Jesus into the world, and Jesus sent them into the world (v. 18).
Where interpretation differs (only where needed)
What “the world” means here. Some read “world” mainly as humanity in general, especially humans who resist God’s revelation; the hatred is the response of people who reject the message. Others read it more as the organized pattern of life opposed to God (values, pressures, loyalties), which can include social and religious networks, not just individuals. Both readings can fit the text’s emphasis on hostility and belonging (vv. 14, 16).
What “keep them from the evil one” involves. Some take this primarily as spiritual protection from the devil’s influence and deception, with harm still possible. Others think it includes protection from destructive outcomes more broadly, though not necessarily removal from danger, since Jesus explicitly rejects taking them out of the world (v. 15).
What “sanctify” means in vv. 17–19. Some emphasize being set apart for a role (a mission shaped by truth), because v. 18 ties sanctification directly to being sent. Others think it also implies moral transformation (being made holy in character), since “sanctify” language often includes ethical purity, and Jesus links it to truth and to his own self-setting-apart (vv. 17, 19).
What “your word is truth” refers to. Some understand “word” mainly as the message God has given through Jesus (the revelation Jesus delivered to the disciples). Others understand it more broadly as God’s spoken and written communication (including Scripture), while still recognizing that in this prayer Jesus is talking about what he has given them (v. 14).
Why the disagreement exists
Key terms are compact and flexible: “world” can mean the human realm, or the hostile stance within it; “keep” can focus on protection from evil influence or from evil outcomes; “sanctify” can mean being dedicated to a task and/or being made holy; and “word” can mean a message spoken, or God’s communication more generally. The immediate context pushes strongly toward mission (v. 18) and continued exposure (v. 15), but the broader Gospel uses these same words in multiple connected ways (truth as revelation, sanctification as dedication).
What this passage clearly contributes
This unit presents a mission-within-tension: disciples are sent into ordinary public life (“in the world”) while not belonging to its controlling loyalties (vv. 15–16). It links opposition to receiving God’s word (v. 14), and it locates their ability to continue in two supports Jesus requests: protection from the evil one (v. 15) and being set apart “in truth” grounded in God’s word (v. 17). It also grounds their mission in Jesus’ own mission and dedication: as the Father sent Jesus, Jesus sends them; and Jesus’ self-setting-apart is “for their sakes,” enabling theirs (vv. 18–19).