Let your readers know who you are and what you are doing. Share your vision, dreams and desires and give them an insight to what your website is all about.
Your why is really the reason behind everything you do and if people connect on a deeper layer with what you do and why you do that, they are attracted to work with you and want to know more. You only have a view seconds here on the homepage to make a first little connection.
How wonderful it is that nobody needs to wait a single moment before starting to improve the world.