There are plenty of locks in the world. Keyed or with combinations, with latches or chains or deadbolts. If you have enough of them you can keep pretty much anyone out. Which is OK so long as you don’t want to let anyone in.
What helps you to feel most deeply secure?

I haven’t counted the words in the 23rd Psalm, KJV except just now rather quickly: I get about one hundred and sixteen. I remember that there were two hundred seventy two words in the Gettysburg Address. Point being: they are such perfect compositions, and they are both short enough that I can actually recite them both to myself from memory. So can a lot of folks that went to my elementary school. The text of the Psalm is itself reassuring, of course, but the fact that both compositions exist and are valued so highly is evidence of folk’s fundamental goodness. That makes me feel secure.
Being ignored!