Theaetetus

The perfection of style, the humour, the dramatic interest, the complexity of structure, the fertility of illustration, the shifting of the points of view, are characteristic of his best period of authorship.

风格的完美、幽默、戏剧性的兴趣、结构的复杂性、插图的丰富性、观点的转变，这些都是他创作巅峰时期的特征。

If sensations are always true, and one man's discernment is as good as another's, and every man is his own judge, and everything that he judges is right and true, then what need of Protagoras to be our instructor at a high figure?

如果感觉总是真实的，一个人的判断力和其他人一样好，每个人都是自己的裁判，他所判断的一切都是正确和真实的，那么我们为什么还需要普罗泰戈拉斯以高价来教导我们呢？