There are many famous sayings about knowing and doing. The following are some common ones: Knowledge is not something complete, pure, flawless, rigid and unchanging. It is forever breathing in the air of practice and forever growing in the conflict of contradictions. Hegel Man's knowledge is not to talk to himself, but to talk to others and to nature. Plekhanov True knowledge is revealed, not instilled; it is free, not limited; it is the crystallization of human wisdom, not the product of blind obedience. Carnegie Knowledge can only grow if it is constantly used. Only if it is put on the shelf can it gradually rot. Lu Xun Knowledge is not something complete, pure, and unchanging. Knowledge breathed in the air of practice and grew in the conflict of contradictions. Knowledge was ever-changing and evolving. Hegel Reading books alone cannot improve knowledge, only practice is the only way to acquire knowledge. ding ling Knowledge gives weight, achievements give glory, most people only see the glory and don't weigh it. Lu Xun Knowledge is not something complete, pure, unchanging. Knowledge breathed in the air of practice and grew in the conflict of contradictions. Knowledge was ever-changing and evolving. Hegel Learning is not for exams or to become an expert, but for practice. Lu Xun Knowledge is the source of all knowledge. Without knowledge, there is no knowledge. Hugo