There are many important days in our lives, I have heard it said that the two most important days are... 

1 - The day we were born.

2 - The day we figure out why.

They are both births so to speak and the second day will become the most important once we get to it. Many people are able to figure this out very young. Some unfortunately never do and live a life of frustration. Knowing why we came into this experience is a point at which our lives can shift to a much simpler life. Not easy, only simpler as we then know the best choices for the path of our life.