Slogan read a good book and be happy for a while.

the next sentence of the slogan is "study hard and be happy all your life".

The slogan "Reading a good book will make you happy for a while, and reading a good book will make you happy all your life" emphasizes the importance of reading. "Reading a good book" means choosing excellent books to read, which can bring inspiration and wisdom to people and make people feel happy and satisfied. "temporary happiness" expresses that the happiness brought by reading a good book can make people get spiritual nourishment in a short time. "Lifelong happiness" expresses that the happiness gained through reading is long-lasting.