400
Find the meaning of this quote, “A city built and fortified atop a tall hill cannot be taken, nor can it be hidden.”
This saying urges strength in defense while at the same time encouraging openness. You should not try to protect yourself by hiding your light, but at the same time you should be aware that attacks are likely. Ultimately you will be safe, above real danger, even if you expose yourself and your light to the world.(The Gospel of Thomas, 32)