Titus 1:16 Know God .. They (the Jewish opposition) arrogantly claimed to be God's people. Paul uses very strong words!1) Abominable .. repulsive 2) They won't hear God 3) and i.e. useless to God (reprobate.) Reprobate .. used of a counterfeit coin low in weight; used of coward who fails in the test of battle; used of a stone which builders rejected.