2 Timothy 1:11-12

So Jesus abolished death and brought to light life and immortality through the gospel. This gospel is that which Paul was appointed a preacher and apostle and teacher. This wasn't the job Paul originally signed up for. If you recall, he was on his way to persecute Christians before his life was changed. Timothy was called to share in suffering, and Paul's appointing to preach and teach the gospel is the reason for Paul's suffering. Those who are like Paul and are called to such a holy calling are also those who suffer for it. It's not as if it's a terrible job; it is a great job to be called by God to a holy calling. However, as it did to Paul, it will bring suffering.