He will be more sympathetic to those who are similar to the way he once was.
Explanation:
From the book, "Flowers for Algernon" by Daniel Keyes, Charlie Gordon was once mentally ret*rded but he became more intelligent after he underwent surgery.
He has an experience in the diner one day after a mentally ret*rded boy mistakenly crashes some plates and receives cruel taunts from the other customers and the boy who does not know he is being taunted and insulted, smiles with them and this episode makes Charlie so angry that he shouts to the insensitive crowd that the boy is a human and thus deserves respect.
This experience would likely change Charlie because He will be more sympathetic to those who are similar to the way he once was.
I would say that this is right. If the person decided to send their money to a person who needed it then that alone is a wonderful thing to do. As for the fact that the sender did not include his/her name, they might not want recognition or praise for their actions. Many people decide to donate anonymously because they want to help the cause without getting involved personally.