It's hard to make improvements in your life if you don't know why you want them.
You will have a much greater chance of success when you know why you want to achieve the things you want to achieve.
It's often not enough to just say "I want to quit smoking" or "I want to lose weight" or "I want to clean out the garage"
While wanting something is a start, it's still not the true motivation and that's why your WHY is important.
There are goals and actions and motivations to all we want to achieve but until the WHY is at the forefront of our mind it will be much harder to stay on task, plan, action, etc.
Your WHY will always be the motivation that drives you to attain your goals.