A very nice story and touching

One day, a blind boy sat in the corner of the road and waited for someone to throw .... any currency to buy food. Near there was a board on which was written 'I am blind, please be mercy' .. A man approached, threw a coin & erased what was written on the blackboard. The boy realized I did not speak. Later, the boy heard that many people were throwing coins we can of it. After an hour the man returned and asked the boy how he was going. He replied 'my cans full of coins, what You entered the planks? ..
And man shall read 'Today is a very nice day, but i can not see it'