Today is my 40th birthday.

When I turned 30 a decade ago, I wrote an article sharing life lessons to survive your 20s and crowd-sourced advice on how to excel in your 30s. And apparently you guys loved it.

So, here's more of the good stuff: 40 life lessons I now know at 40 that I wish I knew at 20.

Dig in.
1. Your relationship with others is a direct reflection of your relationship with yourself
If you treat yourself poorly, then you will also unconsciously seek out and tolerate others who treat you poorly.

If you treat yourself with dignity and respect, then you will only tolerate others who treat you with dignity and respect.

Get right with yourself, get right with the world.
2. The only way to feel better about yourself is to do things worth feeling good about
Respect is earned, not given.
3. The only failure is not trying
The only rejection is not asking. The only mistake is not risking anything.

Success and failure are fuzzy concepts that only exist in your mind before you do something. Not after.

After the fact, everything will be a mixture of both. The only real …