學習如逆水行舟，不進則退。
26、learning without thought is useless; thought without learning is dangerous.
學而不思則罔，思而不學則殆。
27、there is no end to learning.
學無止境。
28、ignorance is the curse of god, knowledge the wing wherewith we fly to heaven.——william shakespeare
無知乃是罪惡，知識乃是我們藉以飛向天堂的翅膀。——莎士比亞
29、it is harder to conceal ignorance than to acquire knowledge.
掩蓋無知要比學到知識更難。