Letter to the Philippians 2,12-18. 
Therefore, my beloved, just as you have always obeyed me, not only in my presence, but much more now in my absence, work out your own salvation with fear and trembling;
for it is God who is at work in you, enabling you both to will and to work for his good pleasure.
Do all things without murmuring and arguing,
so that you may be blameless and innocent, children of God without blemish in the midst of a crooked and perverse generation, in which you shine like stars in the world.
It is by your holding fast to the word of life that I can boast on the day of Christ that I did not run in vain or labour in vain.
But even if I am being poured out as a libation over the sacrifice and the offering of your faith, I am glad and rejoice with all of you
and in the same way you also must be glad and rejoice with me.

Paul calls us to fly high, to "shine like stars in the world". We are not from this earth and not even from another planet, but from another star, more brilliant than the sun... and it should be clear to anyone who just looks at us.

We have nothing to murmur and argue about, because we know that the suffering of this moment are not comparable to the glory that we will receive later: they are very small things. When we murmur and complain and get angry with each other, we manifest that our christian faith in the resurrection and in the new world to come is not so firm.

 

Paul cares about our salvation with all his heart and he doesn't mind how much he could pay for that. He really got similar to Christ who desired to suffer every suffering in order to save us and let us join his kingdom of love. Like Jesus, Paul feels joyful and suffers with joy for us, because he's is so firm in the faith that all his pains are already "redeemed", that is al already transformed into a heavenly happiness that is waiting for us.