Not that I have already obtained all this, or have already arrived at my goal, but I press on to take hold of that for which Christ Jesus took hold of me. Brothers and sisters, I do not consider myself yet to have taken hold of it. But one thing I do: Forgetting what is behind and straining toward what is ahead, I press on toward the goal to win the prize for which God has called me heavenward in Christ Jesus.
No matter what happens or what we’re up against, we in Jesus have to take the attitude that we are going to press on, come what may. That is often not easy at all. But instead of caving into the pressures, we need to thank God for the promise of his presence and love and final salvation.
Paul is referring to the goal perhaps of Christ-likeness in a cross-shaped life as we consider the context of that passage (see link above). Ironically the troubles of this life can contribute mightily to the goal of being like Christ in his death and so knowing the power of his resurrection in our lives now. Therefore we can take heart and gather strength even through our weakness by the troubles and problems which beset us.
Admittedly, Philippians 3 (although we need to consider the entire book) does not deal with trials. What is talked about there is the new life in Christ by the Spirit as opposed to the old life in the flesh. We leave behind all that we held dear of the old life apart from Christ and press forward to all that God has for us in the new life in our Lord. And we keep pressing on. Not content with anything less than God’s high calling for us in Jesus.