The operative word in these verses is "seek". Interesting that he does not say seek God. He says to seek things that are in accordance with his kingdom and his righteousness. I think that it is always wise to know that not all who seek God seek him in accordance with righteous kingdom principles. I think that Paul gives us a picture of what this looks like when he says:
Therefore let us not pass judgment on one another any longer, but rather decide never to put a stumbling block or hindrance in the way of a brother. I know and am persuaded in the Lord Jesus that nothing is unclean in itself, but it is unclean for anyone who thinks it unclean. For if your brother is grieved by what you eat, you are no longer walking in love. By what you eat, do not destroy the one for whom Christ died. So do not let what you regard as good be spoken of as evil. For the kingdom of God is not a matter of eating and drinking but of righteousness and peace and joy in the Holy Spirit.Interesting that Paul speaks to the issue of judging people by what they eat and drink. Jesus says it is not about food, drink and clothing. Paul elaborates about this and tells us that it the issue is walking in love. Love is the currency of the kingdom of God. Love is at the core of being righteous. When we seek first to love we seek God's kingdom and righteousness.
I do not need things Lord. I need you. Fill me afresh with your love.