Including Oso-eko (Virtue as instructed by Amida for going to the Pure Land), the alternative of the two types, both Eko together are called 'O-Kan Ni-eko' forming the primary doctrine of Jodo Shinshu (the True Pure Land Sect of Buddhism).
もう一方の「往相回向」と合わせ、「往還二回向」とよび、浄土真宗における、中心教義である。