This is saying that it's good to be happy about little things. Every little accomplishment you make is one step closer to what you are trying to achieve. Don't just think because it is something small that it doesn't matter. If your don't celebrate the little things, trying to accomplish your goal will be hard.
I believe in keeping my chin up. Not every day is going to go as planned and sometimes things will get tough. It is important to remember to keep going through the tough times and keep a strong head on your shoulders to in order to move through each day.