"First seek the kingdom of God and His righteousness" was voiced by Jesus in "The Sermon". The kingdom part is obvious. We want to be about "My Father's business", but why His righteousness?
We are to seek His because ours won't do....ever. Our combined right way of doing things...any things...many things....will never meet the standards of God. Never. Not even close. Until one accepts this fact, he will forever be seeking the kingdom on his own righteous standard....and he'll never find the kingdom. The kingdom is a wonderful secret buried in front of only the surrendered eyes.
I am a louse. Fact. I am not close to shoring up a couple of my strengths in order to impress Him...or you. I can't cut it. Jesus rightness cuts it. God switched out my sour rightness with Jesus's sweet rightness while Jesus wasn't looking on the cross!
Am I right with God? Oh, yeah! But never because of anything I do, but because of all He did. "He made Him who knew no sin be sin on our behalf that we might be come the righteousness of God(II Cor. 5:21)." I am right---not on the basis of how good I've done, but---on the basis of how wrong Jesus became on the cross.
"He saved us, not on the basis of deeds we have done in righteousness, but according to His mercy....(Titus 3:5)"
The only ones saved are all who reach a clear understanding we cannot save ourselves.