在生物圈的地质历史演化中，智慧圈是众多阶段的最后一个阶段。
【译文】不要笑话别人很老，自己有一天也会变老。同邻里相处好，就像捡到一块宝贝一样可贵。只要安分守己做人，一生都不会有烦恼。
I believe that man will not merely endure: he will prevail. He is immortal, not because he alone among creatures has an inexhaustible voice, but because he has a soul, a spirit capable of compassion and sacrifice and endurance.
All who joy would win must share it. Happiness was born a twin.
The biggest risk is not taking any risk.
The world is a story without an ending.
人类智力的发展都应该主要归功于欲望，而欲望能否被普遍满足要依靠智力的发展。