ιδου verb - second aorist active middle - second person singular
idou  id-oo': used as imperative lo!; -- behold, lo, see.
μυστηριον noun - accusative singular neuter
musterion  moos-tay'-ree-on:  a secret or mystery (through the idea of silence imposed by initiation into religious rites) -- mystery.
υμιν personal pronoun - second person dative plural
humin  hoo-min': to (with or by) you -- ye, you, your(-selves).
λεγω verb - present active indicative - first person singular
lego  leg'-o: ask, bid, boast, call, describe, give out, name, put forth, say(-ing, on), shew, speak, tell, utter.
παντες adjective - nominative plural masculine
pas  pas: apparently a primary word; all, any, every, the whole
μεν particle
men  men: indicative of affirmation or concession (in fact); usually followed by a contrasted clause (this one, the former, etc.)
ου particle - nominative
ou  oo: no or not -- + long, nay, neither, never, no (man), none, (can-)not, + nothing, + special, un(-worthy), when, + without, + yet but.
κοιμηθησομεθα verb - future passive indicative - first person
koimao  koy-mah'-o: to put to sleep, i.e. (passively or reflexively) to slumber; figuratively, to decease -- (be a-, fall a-, fall on) sleep, be dead.
παντες adjective - nominative plural masculine
pas  pas: apparently a primary word; all, any, every, the whole
δε conjunction
de  deh: but, and, etc. -- also, and, but, moreover, now (often unexpressed in English).
αλλαγησομεθα verb - second future passive indicative - first person
allasso  al-las'-so:  to make different -- change.