John 17:21

That they also may be in us (ina kai autoi en hmin wsin). Another purpose clause with ina and the present active subjunctive of eimi. The only possible way to have unity among believers is for all of them to find unity first with God in Christ. That the world may believe (ina o kosmo pisteuh). Another purpose clause with ina and the present active subjunctive of pisteuw, "may keep on believing." Beyond a doubt, strife, wrangling, division are a stumblingblock to the outside world.