Television Source

"I can't save you from this. There's nothing I can do to stop this. I stole your childhood and now I've lead you by the hand to you're death. You know, the worst thing is I knew, I knew this would happen, this is what always happens. Forget your faith in me." ~ The Doctor, "The God Complex"

... Life changes in the instant that the Doctor chooses a person as his companion. For Amy Pond, this change occurs at the young age of 7, when she first meets the Doctor. However, it isn't until 12 years later that they have their first adventure together, thus, Amy spent her entire childhood ("I stole your childhood") waiting for the Doctor's return. The episode the quote is taken from, "The God Complex", is focused on a hotel that contains a room for every person that has the misfortune of ending up there. Each room contains the person's greatest fear, placed to make the person fall back on their fundamental belief. This belief is ultimately the downfall of the characters, as it is what a terrible creature feeds off of. Amy, when encountering her room, falls back onto her only significant belief, her trust in the Doctor. In order to save Amy, the Doctor must make her lose her faith in him. In only a few sentences, the Doctor manages to break the trust between Amy and himself, a deep trust that was created over a year of fantastic and dangerous adventures together. This puts a bit of a twist onto the quote "Trust, years to earn, seconds to break", as it was a a series of sentences rather than a few seconds that broke Amy's unadulterated faith in the Doctor. Another twist that this source puts on the first quote, is that, although it is not directly mentioned, Amy and the Doctor are able to fall right back into the deep trust they share after the danger has passed. To me, this proves that trust can be broken and still med itself perfectly, in some cases even after a very brief amount of time. Though trust can be fragile, and broken by a few simple words or actions, it can be a feeling so strong it can overcome tremendous difficulty....