A Good Soldier of Christ Jesus

2:1 You then, my child, be strengthened by the grace that is in Christ Jesus, 2 and what you have heard from me in the presence of many witnesses entrust to faithful men, who will be able to teach others also. 3 Share in suffering as a good soldier of Christ Jesus. 4 No soldier gets entangled in civilian pursuits, since his aim is to please the one who enlisted him. 5 An athlete is not crowned unless he competes according to the rules. 6 It is the hard-working farmer who ought to have the first share of the crops. 7 Think over what I say, for the Lord will give you understanding in everything.

8 Remember Jesus Christ, risen from the dead, the offspring of David, as preached in my gospel, 9 for which I am suffering, bound with chains as a criminal. But the word of God is not bound! 10 Therefore I endure everything for the sake of the elect, that they also may obtain the salvation that is in Christ Jesus with eternal glory. 11 The saying is trustworthy, for:

  If we have died with him, we will also live with him;
12   if we endure, we will also reign with him;
  if we deny him, he also will deny us;
13   if we are faithless, he remains faithful—

for he cannot deny himself.

(ESV)

Purposeful Endurance