“For all seek their own, not the things which are Jesus Christ’s.”
Philippians 2:21

The Bible says:
“And if children, then heirs; heirs of God, and joint-heirs with Christ…” Romans 8:17
You are an heir of God and a joint-heir with Christ, that means all that he has is yours, just like he told us all that the father had was his:
“All things that the Father hath are mine…” John 16:15
Knowing this, it then means that seeking the things which are Jesus Christ’s is actually seeking that which has become yours- serving in the kingdom of God, is serving in our kingdom; we are all members of the household of God:
“Now therefore ye are no more strangers and foreigners, but fellowcitizens with the saints, and of the household of God;” Ephesians 2:19
The gospel of the Lord Jesus is the gospel of our kingdom and as you share it, you aren’t just sharing that which you must but have no relationship with- you are sharing that which is yours also; it is also your gospel, personalize it just like the Apostle Paul did:
“In the day when God shall judge the secrets of men by Jesus Christ according to my gospel.” Romans 2:16