What this quote is trying to say is that when you are enthusiastic you have more pride in you. The more you are enthusiastic you will be that even more each day. you won't feel as much pain when you weren't enthusiastic. Even though you might be sad for a while you will always be happy because you have enthusiasm. You won't always have it in you. Always think what is right and be happy. Don't let sadness take over you just be more enthusiastic. Always think a head of time, because you will be more enthusiastic. The more you think ahead the more you will be happy in life.