Their happiness, their sadness, and their life choices are all dictated by their immediate surroundings. There is little awareness of what’s beyond, and this unfortunately does not lead to happiness. A person can live for 70, 80, 90 years in his little world and never fully experience the beauty of life and the blessings that God has in store for him.
This is why the concept of tzedakah (charity) is one of the foundations of Judaism. Because we are not all on the same spiritual and material level, those that have been blessed with more must see to the needs of those who have less.
By sharing what we have with others, we are capitalizing on the precious opportunities that God gave us to be His ambassadors in this world. This is why tzedakah is one of the highest mitzvot a person can do. There are many levels of tzedakah, from giving a loan to giving food. Even a smile is a form of tzedakah.