"After they had passed the first and the second guard, they came before the iron gate leading into the city. It opened for them of its own accord, and they went outside and walked along a lane, when suddenly the angel left him" (NRSV).
The Apostle Peter has been arrested by Herod and kept in prison, while "the church prayed fervently to God for him." He is chained between two guards when an angel appears, wakes him, removes his chains (they "fell off his wrists") and leads him to safety.
Metaphysically, angels are emissaries from God, divine ideas from Divine Mind. We can't call them, or order them to appear. But if we maintain a prayer consciousness, they will appear when we least expect them. They awaken us to our own spiritual powers. It's important to note that the angel does nothing but direct Peter on the steps he is to take – wake up, get dressed and start moving. The angel doesn't even remove the chains; they simply "fell off" once Peter awakened to spiritual possibility and began to take action. And the iron gate "opened for them of its own accord" – it doesn't tell us the angel did anything to cause it to open.
It's so with us, as well. Divine ideas won't do the work for us. They will guide us unerringly in the work that's ours to do. And no gate, no obstacle, can prevent our progress when we are linked to the innate power of divine ideas. We resist any belief in confinement or limitation, we stand – fully awake – and “act as if.” We choose to believe in the Power of God over the evidence of our senses. And when God is for us, what force is there in the universe that can be against us? Only our own sense of fear and smallness.
Once that is overcome, the path is clear and easy.