The purpose of giving Tzedakah is to sanctify ourselves and to help us lead more elevated and spiritual lives. Giving Tzedakah provides for someone else’s physical needs. It has been said, we are measured not so much by what we buy, but by what we give. One doesn’t need to say a blessing before the mitzvah of giving Tzedakah. But please know this… Every time a letter with a check enclosed arrives on my desk, or an email dings on my computer indicating a gift has been received from a stock transfer or designation from a Philanthropic fund, I say a blessing to Gd on your behalf.