What's done cannot be undone.
The value of a college education is not the learning of many facts, but the training of the mind to think.
Facts have to be discovered by observation, not by reasoning.
When you are studying any matter, or considering any philosophy, ask yourself only: What are the facts, and what is the truth that the facts bear out. Never let yourself be diverted, either by what you wish to believe, or what you think could have beneficent social effects if it were believed; but look only and solely at what are the facts.
The thing done avails, and not what is said about it. An original sentence, a step forward, is worth more than all the censures.
The degree of one's emotions varies inversely with one's knowledge of the facts.
To kill an error is as good a service as, and sometimes even better than, the establishing of a new truth or fact.
I think that only daring speculation can lead us further and not accumulation of facts.
