Do Be Do
It is entirely possible to do the will of the Father without being moved by what we are doing. We can follow all the requirements of a good and just society, without caring about the interests of others. We can do all of these things, but care only about looking good, which is precisely the opposite of what Paul was asking of the believers in Philippi.
On Quitting
Especially in the church, there is a tendency to elevate perseverance to the level of saintliness. Giving up in the face of hardship is considered akin to blasphemy, because, after all, Look at the example of Jesus, who died on the cross for you. Or look to Paul, who endured extensive amounts of torture and imprisonment to bring the good news of Jesus Christ to far off lands. What are our mere troubles when compared to the hardships endured by those two?