“A secret's worth depends on the people from whom it must be kept.”
“I've kept alot of secrets from a lot of people that i never should have, but the ones I kept from myself stung a lot worse than any of those”
“The value of secrets is ever fluctuating although ladies who have been in society for a long time learn that a secret kept can be worth more than a secret told.”
“God, if only I were smart enough to know I'm worth more than being kept secret”
“How could such a large door be kept secret from everybody outside, apart from the dragon?" [Bilbo] asked. He was only a little hobbit you must remember.”
“It was the only secret I kept from her and eventually it became impossible to fix. With a secret like that, at some point the secret becomes irrelevant. The fact that you kept it does not.”