Abu Hurairah reported that the Messenger of Allaah (saws) said: “Ramadaan has come to you – a blessed month. Allaah has made it obligatory on you to fast in it. During this month, the gates of heaven are open, the gates of the Hellfire are closed and the evil devils are chained. To Allaah belongs a night in it, which is better than a thousand months. Whosoever is prevented from its good, then he has been deprived.” 
The hadeeth is a glad tiding to the righteous servants of Allaah, of the coming of the blessed month of Ramadaan. The Prophet (saws) informed his Companions of its coming and it was not just a simple relaying of news. Rather, his intent was to give them the glad tidings of a magnificent time of the year, so that the righteous people who are quick to do deeds can give it its due estimate. This is because the Prophet (saws) explained in it (the hadeeth) what Allaah has prepared for His servants from the ways towards gaining forgiveness and His contentment – and they are many. So whoever has forgiveness escape him during the month of Ramadaan, then he has been deprived with the utmost deprivation.