Charity is a fundamental part of Judaism. We are taught from a young age to give with happiness and a full heart. The Maharal observes that charity is different from all other commandments. When other commandments are performed more than once, it is considered as two separate good deeds. One who dons tefillin today and again tomorrow has performed two separate commandments. This is not so with tzedakah. If we give something to one person today and to another person tomorrow, the second gift is related to the first one, and both contributions merge into one large act of kindness. Thus all the thousands upon thousands of charitable gifts a person distributes throughout his lifetime are inseparably bonded into one huge, lifelong mitzvah.