Here’s a surprise for some. All believers are considered first-borns.
22 But you have come to Mount Zion and to the city of the living God, the heavenly Jerusalem, and to innumerable angels in festal gathering, 23 and to the assembly of the first-born who are enrolled in heaven, and to a judge who is God of all, and to the spirits of just men made perfect, 24 and to Jesus, the mediator of a new covenant, and to the sprinkled blood that speaks more graciously than the blood of Abel. Heb. 12:22-24
We now all have the special blessings and therefore the responsibilities of a firstborn.
The first responsibility is to take care of our mother.
But the Jerusalem above is free, and she is our mother. Gal. 4:26
The other responsibility of the firstborn is to take care of the rest of the family.
And this is his commandment, that we should believe in the name of his Son Jesus Christ and love one another, just as he has commanded us. 1John 3:23
So our first thought and action of each morning is to seek the Kingdom of God and to build it up.
Even the Messiah understood that the Father’s will come first.
“I can do nothing on my own authority; as I hear, I judge; and my judgment is just, because I seek not my own will but the will of him who sent me.” John 5:30