Some people say, "Man is his own undoing." That's a pretty direct way of saying the majority of issues that you'll face are going to either be self-manifested in origin or personal in solution. At any rate, this somewhat ambiguous proverb is motivation enough to get your hustle on.
Bad day? Hustle harder. Girlfriend left you? Hustle harder. Behind on rent? Hustle harder.
But above all else: Work smarter. The solution you need is usually right in front of you.