The beauty of spirit of God in tight relation to our own spirit is thrilling. It is followed by ‘heir, heirs of God and joint-heirs with Christ’! When a word is repeated like this it places added emphasis on the word.
John relates a similar message in I John 1:3.
3 That which we have seen and heard declare we unto you, that ye also may have fellowship with us: and truly our fellowship is with the Father, and with his Son Jesus Christ. I John 1:3
Because we are joint-heirs with Christ, we can also be subject to the persecution suffered by Christ as anyone who has stood for God and His son has readily experienced, but that also means the glory is to be shared too. We can joyfully work through pressure and opposition knowing that we are strengthened by the His spirit in connection with our spirit. All of chapter 8 of Romans reflects this. It is a great chapter to read in its entirety, but verses 32-37 sum it up beautifully.
32 He that spared not his own Son, but delivered him up for us all, how shall he not with him also freely give us all things?
33 Who shall lay any thing to the charge of God’s elect? It is God that justifieth.
34 Who is he that condemneth? It is Christ that died, yea rather, that is risen again, who is even at the right hand of God, who also maketh intercession for us.
35 Who shall separate us from the love of Christ? shall tribulation, or distress, or persecution, or famine, or nakedness, or peril, or sword?
36 As it is written, For thy sake we are killed all the day long; we are accounted as sheep for the slaughter.37 Nay, in all these things we are more than conquerors through him that loved us. Romans 8-32-37
It is simple to apply this as there are so many opportunities every day that call for its application. Everyday there is pressure and we can decide to give in to it or trust God as He works in our hearts.
There is great joy experienced when decide to trust God (I John 1:4).