It’s an old song, sung a lot of ways by a lot of people. I tend to prefer the Johnny Cash version the best, but that’s no surprise. One verse really stands out.
Well you may throw your rock and hide your hand
Workin’ in the dark against your fellow man
But as sure as God made black and white
What’s done in the dark will be brought to the light
It’s not a popular position today but I do believe that much like there are physical laws at work in our universe there are also moral or spiritual laws as well. I believe that whenever anyone seeks to find the truth about life, that when they do it will be in line with these laws. Of course I also think a lot of people could save quite a bit of time by reading the Bible and getting a jump start on discovering what these truths are. All that to say that this portion of the song is based on scripture and is, I believe, something that can be depended on as much as gravity or the fact that 2+2=4.
For all that is secret will eventually be brought into the open, and everything that is concealed will be brought to light and made known to all.