Tenacity: "holding fast; characterized by keeping a firm hold; persistent or obstinate." Things tend to get toughest right before the greatest victory comes, almost like a paper wall; it looks daunting, but all you need to do is run on through (like a football team coming on the field-- can you imagine them stopping right before the paper banner?) Don't quit 5 minutes before the miracle happens, just hang on and "run on through."
Catch it, come alive, pass it on.