It’s pretty common for people to say that humanity is generally good. Evil in the world comes, then, either from a few bad people scattered amongst the predominantly good population, or else from good people who simply do some bad things, because of their upbringing or other external influences.
But Jesus, in Mark 7:1-23, paints a much bleaker picture of humanity. The terrible truth is that we are all bad people – we have bad hearts – and we can’t do anything about it.
So we must look to Jesus alone to solve the problem of our bad hearts. And we shouldn’t be surprised when seemingly good people – even our most respected church leaders – do bad things.