Emerson's famous saying "The reason why people are lonely is because they don't build bridges, but build walls to surround themselves"

The History of Song Dynasty·The Biography of Wu Jie": " If you are good at reading history, you can learn from the past. If you keep it for a long time, it will be a motto for your walls."

Pessimists say: There are countless walls in this world.

Optimists say: There are countless doors in this world.

Realists say: The world is composed of countless walls of separation and doors of communication.

The door is in your hand, the wall is in your heart