The narrow way -- what won't fit?

Jesus' most famous teaching is possibly the Golden Rule: Do unto others as you would have them do unto you (Matthew 7:12). Odd, then, that this is followed immediately by a teaching that can be viewed unfavorably: "Enter at the narrow gate. For wide is the gate and easy is the way that leads to destruction, and many enter there. But narrow is the gate and difficult the way that leads to life, and…