The Jews regarded Psalm 69 as Messianic in Paul"s day (cf. John 15:25). The quotation from this psalm ( Romans 11:22-23) records David"s desire. He wished that his enemies" table (i.e, blessings) would become something that they would stumble over. The enemies in view were the Lord"s enemies as well as the king"s since David was the Lord"s anointed. This is really what had happened to the Israelites who had set themselves against God by rejecting His Son. Inability to see clearly and bondage to the Law had resulted (cf. Acts 15:10). The Greek phrase dia pantos usually means "continually." It probably means that here rather than "forever." [1] Paul would explain that Israel"s obstinacy and bondage would not last indefinitely ( Romans 11:26). Paul explained that God had brought upon the Jews what David had prayed would happen to his persecutors. [source][source][source]
Even though as a whole Israel had reaped the fruit of her own stubborn rebellion against God, God had called a remnant within the nation for salvation. The presence of this remnant shows that God has not cast off His chosen people completely or been unfaithful to His promises to them. [source][source][source]