For we are become partakers of Christ (metocoi gar tou Cristou gegonamen). Second perfect active of ginomai, "we have become," not the equivalent of esmen (are). For metocoi see Hebrews 1:9 ; Hebrews 3:1 ; Hebrews 6:4 . We have become partners with Christ and hence (gar, for) should not be tricked into apostasy. If we hold fast (ean per katascwmen). The same condition as in verse Hebrews 6 with per (indeed, forsooth) added to ean. Jonathan Edwards once said that the sure proof of election is that one holds out to the end. The beginning of our confidence (thn archn th upostasew). For upostasi see Hebrews 1:3 ; Hebrews 11:1 . These faltering believers (some even apostates) began with loud confidence and profession of loyalty. And now?