summartureo denotes testimony given in agreement with another witness or confirming source.

The attested use describes confirming testimony alongside another witness: conscience is presented as giving such testimony in Romans 2:15 and Romans 9:1, while the Spirit does so together with human spirit in Romans 8:16.

1. Giving confirming testimony alongside another · dominant

   In Romans 2:15, the present active participle occurs in the clause where conscience accompanies the inwardly written work of the law and thoughts accuse or defend; the APB renders this as conscience "testifying with them." In Romans 9:1, the same participial form accompanies the speaker's truth claim, with the APB rendering conscience "bearing witness with me"; Romans 8:16 uses a present active indicative for the Spirit's testimony together with human spirit that they are children of God.

   Romans 2:15Romans 8:16Romans 9:1

In the Anselm Project Bible: The APB presents the clause with "testifying with them," "testifies together with our spirit," and "bearing witness with me." These renderings reflect the verses' shared-witness setting.