A.T. Robertson Commentary 1 Corinthians 11:31

"But if we discerned ourselves, we should not be judged." — 1 Corinthians 11:31 (ASV)

But if we discerned ourselves (ε δε εαυτους διεκρινομεν). This condition of the second class, determined as unfulfilled, assumes that they had not been judging themselves discriminatingly, else they would not be judged (εκρινομεθα). Note distinction in the two verbs.