John Calvin Commentary Philippians 1:17

"but the other proclaim Christ of faction, not sincerely, thinking to raise up affliction for me in my bonds." — Philippians 1:17 (ASV)

That for the defense. Those who truly loved Christ considered that it would be a disgrace to them if they did not associate themselves with Paul as his companions when maintaining the cause of the gospel; and we must act in such a manner, as to give a helping hand, as far as possible, to the servants of Christ when in difficulty. Observe, again, this expression — for the defense of the gospel. For since Christ confers on us so great an honor, what excuse will we have if we are traitors to his cause, or what can we expect if we betray it by our silence, but that He will in return desert our cause, who is our sole Advocate, or Patron, with the Father? (1 John 2:1)