Considerations

Temptation is a force like the wind on your hands 

hands when stuck out of the window of your car 

the faster you go, the stronger the wind is, squared

but if you stop the car, you'll never get there

Achilles was invincibile, but he had that heel of his.  That heel eventually doomed him.  For someone who had the guarentee of safety everywhere else, that heel, that heel, that heel.

Modern living is currently conflated in the story of Achilles' heel.  For the difficult reality is that one small part of someone's life can destroy someone's life.  There's an unknown saying that the natural course of life in modern times is built on, or should conform to, a structure succinctly put in words as "live while you're young".  But the story of Achille's heel aptly applies here for weakness is not as innate as its assumed it to be -- it can be born from actions, or at least, inaction.

Achille's heel applies because it can be applied to oneself.

The good news is that unlike in the classic Greek tale, the Achille's heel of modernity can be healed.  The bad news is that may not know we have one until we feel its effects. And so the emphasis we put on feeling in modernity is both a downfall and a blessing.  Thankfully, we can also rely on reason.