Islam has a concept of not benefiting from interest. Many times I have seen on this site that if someone keeps his money in a bank, he may donate the interest money to charity in order to get rid of it and that he should not expect any type of reward for that donation because it is not valid charity money.
But what if donating the money makes the person happy that the cause to which he is donating is benefiting? For example, suppose the person is an animal lover, so he donates his interest money to the Humane Society. He knows that this donation does not count as charity for him, but he is happy nonetheless because now the Humane Society has more money.
Does this feeling of happiness count as a benefit such that it makes his donation a violation? If so, how can a person dispose of his interest money in such a way that he will not benefit from happiness? Must he donate it to a cause in which he does not believe? It seems like there are problems with that as well.