1 - Create your own happiness

You are responsible for your thoughts, feelings & actions

By outsourcing this power, you allow external factors (people or situations) to dictate your inner wellbeing.
Plato said;

The man who makes everything that leads to happiness depend upon himself, and not upon other men, has developed the best plan for living happily.
2 - Choose your company wisely

Whether you realize it or not, energy is highly communicable.

You will subconsciously pick up the mentality, moral standards & ambition of the people you spend the most time with.
Plato warned;

People are like soil - they can either nourish you and help you grow as a person or they can stunt your growth and make you wither...
3 - Master yourself

The beginning of wisdom is self-knowledge.

When you are no longer a slave to your vices, societal standards or other people’s judgement - you have mastered yourself.
Your mind is a good servant but a terrible master.

If you don’t rule your mind, it will rule you.

Self-governance is the ultimate virtue.
To quote Plato:

The first and greatest victory is to conquer yourself; to be conquered by yourself is of all things most shameful and vile.
4 - Be content with little

“Wealth consists not in having great possessions, but in having few wants.

Freedom is not procured by a full enjoyment of what is desired, but by controlling the desire”
5 - Be Silent

Plato said;

Wise men speak because they have something to say; fools because they have to say something.
A sound mind grows in the soil of silence.

When you speak less, you refine your thoughts and increase the value of your words.
Thread summary;

1) Choose your company wisely
2) Master yourself
3) Create your happiness
4) Be content with little
5) Be silent

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I like this heuristic, and have a few which are similar in intent to it:

Hiring efficiency:

How long does it take, measured from initial expression of interest through offer of employment signed, for a typical candidate cold inbounding to the company?

What is the *theoretical minimum* for *any* candidate?

How long does it take, as a developer newly hired at the company:

* To get a fully credentialed machine issued to you
* To get a fully functional development environment on that machine which could push code to production immediately
* To solo ship one material quanta of work

How long does it take, from first idea floated to "It's on the Internet", to create a piece of marketing collateral.

(For bonus points: break down by ambitiousness / form factor.)

How many people have to say yes to do something which is clearly worth doing which costs $5,000 / $15,000 / $250,000 and has never been done before.