In Sequence 2: Memory 3, you'll encounter an optional objective requiring you to pickpocket all Templars. There are three of them in the area, which follows shortly after a checkpoint. You can pick their pockets, then chose the option to "Reload Last Checkpoint." When you do, you'll find that the money you pocketed remains in your possession. You can repeat the process as often as you like before continuing the mission, and you can also come back to the mission later in the game if you wish. It's possible to earn 35,000R after around 7 minutes of effort. This exploit may soon be patched, so you'll want to play using the game's initial version if that proves to be the case.