But you, brothers, don't be weary in doing well.
be not weary in well doing: This phrase "be not weary" (ekkakeo) means "to be utterly spiritless, to be wearied out, exhausted" (Thayer 195-2-1573). Paul does not want the misconduct of the wicked or the sternness of his words to shake up the strong and devoted Christians, so he calmly says, "Be not weary in well doing."