QUOTE : Unbeknownst to Harry, Dumbledore also bequeaths him a final message that he entrusts to Snape with instructions to deliver the message only when Harry is close to defeating Voldemort. Snape must stay alive long enough to deliver the message then and no sooner. He must remain tightly Occluded until he meets with Harry. Then he, too, can open at the close. There are other mysteries in Harry Potter and the Deathly Hallows, but the revelation of Snape’s motives is the key to them all. After a buildup of a million words, Rowling finally shows us Snape as he truly is, the full story of how he became the right-hand man of two opposing generals and what was in his heart the entire time.