Follow through will ‘get you through’. Taking the time to keep a dream going means the chances are higher of making your dream a reality. It also makes you feel better and more confident when you successfully complete what you start.
Now that’s not to say you should NEVER switch directions mid-stream. Sometimes after you begin something you realize that’s it’s just not for you. But if you’re always starting, stopping abruptly, and then trotting off in a totally new direction not only won’t you get anywhere but you’ll make yourself awfully dizzy in the process.