How will drinking the Kool-Aid today stop your tremendous success tomorrow?

Listening to Matthew McConaughey read Greenlights on Audible, I was struck by his storytelling, wisdom and resilience. Here’s an excerpt:

“The question we need to ask ourselves is: what is success to us? More money? That's fine. A healthy family? A happy marriage? Helping others? To be famous? Spiritually sound? To express ourselves? To create art? To leave the world a better place than we found it?
What is success to me? Continue to ask yourself that question. How are you prosperous? What is your relevance?
Your answer may change over time and that's fine but do yourself this favor – whatever your answer is, don't choose anything that would jeopardize your soul. Prioritize who you are, who you want to be, and don't spend time with anything that antagonizes your character. Don't depend on drinking the Kool-Aid – it's popular, tastes sweet today, but it will give you cavities tomorrow.
Life is not a popularity contest. Be brave, take the hill. But first answer the question.”

What’s your idea of success today?