The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.

爱不是一种责任，而是一种快乐。

Think wrongly, if you please, but in all cases, think for yourself.

In our reasonings concerning matter of fact， there are all imaginable degrees of assurance， from the highest certainty to the lowest species of moral evidence.

心灵是一个不断变化的过程流。