...
23 And the children of her I will kill with death,
and all the convocations will know that I am the searcher of kidneys* and of hearts,
and I will give to you each according to the works of yours.
...
26 The one both overcoming and keeping My works unto perfection,*
I will give to him authority over the nations,
27 and he will shepherd them by a rod of iron,
like the vessels of ceramic are shattered,
28 as also I have gotten from My Father,
and I will give to him the morning star.
...
Notes
v. 23 Valuable discussions of what "kidneys" could signify (e.g. metaphorically) are provided by Brown Driver Briggs, Thayer's Greek Lexicon, and Liddell Scott Jones.
v. 26 "perfection" or "completion" or "the end"; see analyses by several dictionaries online here.