{If they continue not in their unbelief} (ean m(8820)epimen(9373)i
t(8869) apisti(8369)). Third class condition with the same verb used in
verse  22  of the Gentile. Locative case of apisti(8369) here (same
form as the instrumental in verse  20 ). {For God is able}
(dunatos gar estin ho theos). See this use of dunatos estin
in  4:21  rather than dunatai. This is the crux of the whole
matter. God is able.