Imagine that illusive mentor character that comes in at the right moment and says that little line, that's kind of cliche, but also totally drives the point across.
It might be your grandma. It might be Dumbledore. Either way. Get their voice in your head.
"A chain is only as strong as it's weakest link."
"Great leaders don't blame the tools they are given. They sharpen them." -Simon Sinek
"The only thing worse than training employees and losing them, is to not train them and keep them." - Zig Ziglar
"Train people well enough so they can leave, treat them well enough so they don't want to." - Richard Brown