{If ye know} (ei oidate). Condition of first class
assumed as true, ei and present (oidate used as present)
active indicative. {If ye do} (ean poi(8874)e). Third-class
condition, ean and present active subjunctive, assumed as
possible, "if ye keep on doing." Both conditions with the one
conclusion coming in between, "happy are ye." Just knowing does
not bring happiness nor just occasional doing.