It was recently suggested to me that I choose some kind of phrase or mantra to repeat to myself as a comfort and a sense of meaning or purpose during the worst emotional lows.  My mom finds great comfort in spiritual (mostly Christian) sayings ... but I'm not really religious ( I do enjoy Buddhist writings though).

I was just wondering if anyone else has done this and what their matras might be, or how you decided on them?  I can't for the life of me come up with something that makes me feel like my life matters or like I can keep going.  And I think I need that.