2 Esdras 7:4-9
but its entrance is set in a narrow place so as to be like a river. Whoever desires to go into the sea to look at it, or to rule it, if he didn’t go through the narrow entrance, how could he come into the broad part? Another thing also: There is a city built and set in a plain country, and full of all good things, but its entrance is narrow, and is set in a dangerous place to fall, having fire on the right hand, and deep water on the left. There is one only path between them both, even between the fire and the water, so that only one person can go there at once. If this city is now given to a man for an inheritance, if the heir doesn’t pass the danger before him, how will he receive his inheritance?”