ask yourself 'why?'

This is one of the most viewed TED talks:

How great leaders inspire action | Simon Sinek | TED - YouTube

And this is why:

Why is Simon Sinek’s TED Talk So Important? — Speeko - the #1 public speaking app

But, then, 'why' is at the heart of what he's telling us:

Start with Why - Wikipedia

Start With Why Book | Simon Sinek - Simon Sinek

We can also look at 'how':

How to Find Fulfillment at Work - Big Think

Here's a summary:

Start With Why-Book Summary. How Great Leaders Inspire Everyone to… | by Teja Kancherla | Medium

But not everyone thinks 

As it stands, this method of finding one's WHY can only present a real danger for all those who choose it to define their reconversion and find themselves. It would also be a huge problem if it were offered to students who are often particularly influenced and gullible on this issue.

If it is about inspiring leaders and helping them recruit inspired and happy employees, fine! However, if it is used as a tool to define one's career path, to find one's way or to orient oneself, beware.

I also encourage you to read the negative reviews on Amazon of 1, 2 and 3 stars only where you will find a number of very pertinent criticisms.

Critical review of Simon Sinek “Find Your Why”, a dangerous method

Finally, it might not be such a bad thing to ask ourselves 'why?':

Thinking is such an energy-intensive task that most times we try to avoid it, content to live a zombie life. A study funded by Marks & Spencer showed that up to 96 per cent of people in the UK make decisions on autopilot, avoiding any active thinking and assessment.

Worse still, the study showed the most people find life and living so difficult that they switch into what neuroscientists call “zombie mode” (i.e. living on autopilot) the most when they are at home, environment which feels to them safe and predictable.

Always Ask Yourself “Why” You Do What You Do

And:

The Importance of Asking Why | Psychology Today

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