I'm not sure who said it first, but I heard it said several times at a conference I was attending a few months ago, while listening to Thomas Plummer speak. Again, it was one of those lines that struck me, something I should remember, and something I should do, so I wrote it down.
Now, I'm not a huge fan of posting little notes on every mirror in my house, but this one I do have sitting on my desk, it's right between the phone and the computer, with the sole purpose to be read each day, at least once, but preferably more.
You see it's all about how you approach things. When you wake up in the morning, if your first thought is negative, you haven't started your day off well and you haven't even gotten out of bed. However, if you start your day off on a positive note, you will start to see positive changes through out your day. Sure, annoying and bothersome things are bound to happen each day, there really is no way to avoid them, but how you handle them can effect the outcome of those little annoyances that appear each day.
If you don't put your best foot forward everyday you have no one but yourself to blame when you have a sub-par day. It's just like skipping breakfast, if you do, you'll be hungry on your commute to work and you're likely to stop for an egg and cheese breakfast sandwich when you should have taken a few extra minutes at home to make some oatmeal and egg whites (or anything that's better than a fast food breakfast sandwich.) Then because you ate a bad breakfast the likelihood of eating a bad lunch is greater because you already screwed up today's nutrition. It's a domino effect. Approach each day with the maximal amount of positive energy, to make the most out of each day.
Bring Your Best Everyday.