But seek ye first the kingdom of God, and his righteousness; and all these things shall be added unto you. Matthew 6:33"
In the kingdom of God, first things are first and second things are done second, and so on. When the order is changed when God has not said so, things become jammed and do not yield the expected result.
The opening scripture is a good example, in which Jesus Christ admonished His disciples and admirers to seek the kingdom of God and God's righteousness, and that all other needs would be supplied by God. In other words, find God's utmost interest and receive our Lord Jesus Christ, and all other needs will be met. When you change the order, you will struggle without finding rest for your life.
Even as Christians, we should make Jesus Christ our utmost priority, before anything else, because we are crucified with Christ and the life we live, we live for Christ and not for our own selves, Galatians 2:20.
Dearly beloved, whom are you living for?