I once watched a chicken on top of a blackboard running around inside a circle that had been drawn on it with white chalk. I watched him for a long time as he ran to and fro and hesitated to jump over the white line, which he probably perceived to be a living creature or a high wall.
This is like my soul, I said in sorrow, when she thinks that she is cut off from her freedom either by some mighty giants or by frightful towering walls. In actual fact, between her prison and her freedom there exists only an imaginary line, thinner than a hair.
All the walls of your prison, my soul, consist of your fear of the wold, of your desire for the world and of your thoughts about the world. All these walls you yourself have built according to the instructions of your senses from the material that they have given you, a material that is truly more fragile than foam.
Saint Nicolai Velemirovic, Prayers by the Lake, prayer LVI.