I've always believed that failure is a better teacher than success. We learn so much about ourselves, the world, other people through our failures. Failures can humble us and bring us to our knees, sometimes. But it's only on our knees (through humility) that we're open to learning the greatest lessons about ourselves, I think. When we're arrogant, on top of the world, that's when we're the least open to learning.
Back to Tavis -- he gave a great quote from Babe Ruth (this is Tavis's paraphrase): "Every strike gets me closer to the next home run."
What a wonderful quote for writers! Every rejection, every "no," gets me that much closer to the "yes." I think the failures - the "no's" - are MUCH easier to handle when we realize that they move us one step closer to success.