"Doubt is useful for a while. We must all pass through the garden of Gethsemane. If Christ played with doubt, so must we."

The first sentence of the novel is the most important, but the last sentence is the one that stays with you.

We can’t just keep doing things the way we’ve always done them. The world has changed, and so must we.

The way positive reinforcement is carried out is more important than the amount.

——对共产国际派到广州之达林说，1922年4月27日