υμεις personal pronoun - second person nominative plural
humeis  hoo-mice': you (as subjective of verb) -- ye (yourselves), you.
δε conjunction
de  deh: but, and, etc. -- also, and, but, moreover, now (often unexpressed in English).
αδελφοι noun - vocative plural masculine
adephos  ad-el-fos':  a brother near or remote -- brother.
μη particle - nominative
me  may: any but (that), forbear, God forbid, lack, lest, neither, never, no (wise in), none, nor, (can-)not, nothing, that not, un(-taken), without.
εκκακησητε verb - aorist active subjunctive - second person
ekkakeo  ek-kak-eh'-o: to be (bad or) weak, i.e. (by implication) to fail (in heart) -- faint, be weary.
καλοποιουντες verb - present active passive - nominative plural masculine
kalopoieo  kal-op-oy-eh'-o: to do well, i.e. live virtuously -- well doing.