CYRIL OF ALEXANDRIA:
“Strive to enter in by the narrow door.” This reply may seem perhaps to wander from the scope of the question. The man wanted to learn whether there would be few who are saved, but he explained to him the way whereby he might be saved himself. He said, “Strive to enter in by the narrow door.” What do we answer to this objection?… It was a necessary and valuable thing to know how a man may obtain salvation. He is purposely silent to the useless question. He proceeds to speak of what was essential, namely, of the knowledge necessary for the performance of those duties by which people can enter the narrow door.