I, Paul, write this greeting in my own hand. Remember my chains.
Paul reminds us in his letter that he is still a prisoner, shackled to a guard, limited in his ability to write in his own hand but certainly not helpless. Despite such hardship, he remains faithful and encouraging.
He really is asking that we remember our own chains, ones that are invisible but just as restrictive to our freedom. We are bound to sin as if by chains, locked with the key thrown away, pitiful in our imprisonment. The gospel is now the only key that will spring the lock, unclasp the chains, unbind our hands and feet, free our souls.
Remember my chains? We have just been handed the key.