Niyama: Tapas

Tapas is one of the niyamas (personal ethics).  Literally it means "fire" and is also understood to mean dedication to practice, tenacity and all that good stuff.

For example, posting to your yoga blog, even though it's way past your bedtime, you're cranky,  you still have to finish knitting the present you're giving to a friend at her baby shower tomorrow, you didn't have time to throw down an asana practice or run through dance choreography because you had important things to do like go on a lunch date, buy more yarn, and hang out with your in-laws... because you made a commitment to post your yoga blog every day and you can't quit when you're only on day three.