Whatever harm accrues because of silence can be remedied, but whatever harm is done by speech cannot be remedied. Have you not seen that water is kept in the water skin by tying the mouth of the water skin. It is better to restrain your desires then to stretch your hand before others. A little that is earned because of honest labor is better than larger amount gained through dishonest means. Guard well your secret. Sometimes one is apt to harm himself by his own act. He who speaks more than what is necessary indulges in error.
"When a person dies, his works end, except for three: ongoing charity, knowledge that is benefited from, and a righteous child who prays for him."
Prophet Mohammed (PBUH)
"The best of what a man leaves behind are three: a righteous child who supplicates for him, ongoing charity the reward of which reaches him, and knowledge that is acted upon after him."
Sunan Ibn Mājah
"Every day two angels come down from Heaven and one of them says, 'O Allah! Compensate every person who spends in Your Cause,' and the other (angel) says, 'O Allah! Destroy every miser.'"
Sahih Bukhari