2 Timothy 2:10
Therefore I endure all things for the elect's sakes, that they may also obtain the salvation which is in Christ Jesus with eternal glory.
Note 20 at 2Ti 2:10: One of Paul's secrets to his faithfulness was that he had a love and commitment to Someone and Something bigger than himself. He was enduring hardship, including imprisonment and probable execution, so that others could experience the great salvation he knew through Christ.
Those who serve only themselves will always take the easy way out. Only those who have found the freedom of commitment to a greater purpose will ever sacrifice self. Self-love breeds self-protection at all costs, which is the root of cowardice. Love for others above one's self leads to self-sacrifice for the good of others. That is what Paul had.
Many of us wish we could have the courage of the Apostle Paul to remain faithful to the Lord regardless of the consequences, but that won't happen without making the commitments that the Apostle Paul made. He died to himself (see notes 13-14 at Ga 2:20) so that Christ could live through him. We must do the same if we want the same results.