写作古文的难度，比登上青天还要难。

There are things that happen and leave no discernible trace, are not spoken or written of, though it would be very wrong to say that subsequent events go on indifferently, all the same, as though such things had never been.

The success of a learning algorithm depends on its ability to balance between fitting the data and avoiding overfitting.

"To me, fearless is not the absence of fear. It's not being completely unafraid. To me, fearless is having fears. Fearless is having doubts. Lots of them. To me, fearless is living in spite of those things that scare you to death."

I'm not a role model. I'm a father, a husband, a son, a friend. I'm trying to be the best I can be in those roles.

"In every character, there is a piece of the writer, a piece of the director, and a piece of the actor. It's a collaboration of souls."