There was a phrase I used to have in on my email footer. It was something about those who are afraid to train their workers because they'll lose them. I'm paraphrasing it, but if you don't want to train your workers and you're afraid you're going to lose them, then guess what? They might stay. If you keep them, then they're untrained. Yes, there's always the risk that you're going to train people and they'll leave, but the problem is that they might stay.
On February 21st, 2019. See this statement in context.