to talk of one's dreams (esp. unrealistic, far-fetched ones); to dream out loud
to let slip a secret; to let the cat out of the bag
take it from me; trust me, I'm talking from experience; word to the wise
to be worth telling; to be worth confiding in
(a story) so sad that both the speaker and the listener shed tears
a narrow-minded person cannot understand the ways of the world; (lit.) a frog in the well cannot understand the ocean even if it is explained to it