Board Thread:The Panopticon/@comment-7302713-20130331225051/@comment-6433721-20130401183926

Not really. If the Tenth Doctor hadn't have known he was going to do that, he wouldn't have done that. Same with how the Eleventh Doctor sends himself notes sometimes. The causality requires that an earlier version of Martha would know. It's the opposite in the case of Amy.

It's not narratively permissible, but Moffat did say in One of the Confidentials that the first time we saw it, in Impossible Astronaut, the elder Doctor did die. If he hadn't - if Amy hadn't thought he died and inadvertently spilled the beans, he may not have had the insight to change it.