Self-awareness pays dividends.
No one can take it from you, and it acts as a baked in force-multiplier for your projects since after a while, you develop an understanding around how certain types of work affects you. You can then make better decisions about how (and whether) to spend your time (on certain projects).
Trouble is, honest self-reflection and self-inquiry require an extraordinary amount of courage.
And therein lies the rub.