I’m making a test: on the balcony is a sparrow which expects me to throw some bread from the table on to the balcony, instead of which I drop the bread beside me on the floor in the middle of the floor. It stands outside and from there in the semi-darkness sees the food of its life, terribly tempting, it’s shaking itself, it’s more here than there, but here is the dark and beside the bread am I, the secret power. Nevertheless it hops over the threshold, a few more hops, but farther it doesn’t dare go and in sudden fright it flies away. But with what energy does this wretched bird abound, after a while it’s back again, inspects the situation, I scatter a little more to make it easier for it, and – if I hadn’t intentionally-unintentionally (this is how the secret powers work) chased it away with a sudden movement, it would have got the bread.
– Kafka, Letters to Milena (tr. T. and J. Stern)