在人体神经系统、体能、代谢这三种生理现象中,神经系统的稳定性是最强的。但是,神经系统一旦低下,下降速度会非常之快,而且,几乎不可逆转。对于书画家、雕刻家、能工巧匠们来说,40岁往往是创作的黄金期。四十不惑说的是生理心理均达到成熟状态,其实,更准确地说,40岁是人体神经系统成熟的关键时期。 In the human nervous system, physical fitness, metabolism of these three physiological phenomena, the stability of the nervous system is the strongest. However, once the nervous system is down, the rate of decline will be very fast, and almost irreversible. For calligraphers, sculptors, craftsmen, the 40-year-old is often the golden age of creation. Forty never said that the physical and psychological have reached a mature state, in fact, more precisely, 40-year-old human nervous system is a critical period of maturity.