With awe and inspiration perhaps. I don’t think author of comment above means a particular substance. You can also get energy with sleep, you see.

This reminds me of a popular saying by Vivekananda

‘Everybody’s mind becomes concentrated at times. We all concentrate upon those things we love, and we love those things upon which we concentrate our minds.’

This search/yarn for attention/concentration is a core principle of yoga, and only more relevant with the bombardement of information we have to take on daily base.

Source: https://vivekavani.com/swami-vivekananda-quotes-concentratio...

As a disclaimer: I’m baptised as an Orthodox Christian (in an autocephalous church which is neither Russian, nor Greek), so you can take the above from a philosophical not religious perspective.

There are a bunch of different ways. The best nootropic is sleep, the second-best is exercise.

https://vonnik.substack.com/p/a-few-ideas-that-made-my-life-...

Another good thing to do is block out the energy-suckers; ie distractions, especially the screen-based ones.

That’s what the drugs are for, but if you’re asking how I get enough then the answer is that I don’t.

Basically everything else is about energy preservation.