15:8–9 And God who knows the heart bore witness to them, giving them the Holy Spirit just as he did to us; and he made no distinction between us and them, but cleansed their hearts by faith. A version of the rule of faith (→8:37) that has been recorded by Tertullian confesses “that there is in fact one God, but that under the dispensation which we call ‘economy’ there is also a Son of this one God.”7 That principle of “economy” (οἰκονομία) is a continuing