diatereo denotes keeping something in mind or keeping oneself from specified practices.

The attested uses show keeping statements in the heart and keeping oneself from listed practices; the two clauses support distinct objects of keeping.

1. Keeping statements in the heart · dominant

   In Luke 2:51, διετήρει is an imperfect active indicative describing the mother’s ongoing response to “all these statements”; the APB renders that clause “his mother kept all these statements in her heart.”

   Luke 2:51
2. Keeping oneself from listed practices · occasional

   In Acts 15:29, διατηροῦντες is a present active participle in the conditional instruction about abstaining from sacrificed food, blood, strangled things, and sexual immorality; the APB renders the clause “If you keep yourselves from these things.”

   Acts 15:29

In the Anselm Project Bible: The APB presents the term with “kept” for statements held in the heart in Luke 2:51 and “keep yourselves from” in the instruction of Acts 15:29. These are translation renderings of whole clauses.