Much reading has brought upon us a learned barbarism.

As soon as you know a man to be blind, you imagine that you can see it from his back.

Sickness is mankind's greatest defect.

It is a sure evidence of a good book if it pleases us more and more as we grow older.

To many people virtue consists chiefly in repenting faults, not in avoiding them.

Man is a masterpiece of creation if for no other reason than that, all the weight of evidence for determinism notwithstanding, he believes he has free will.

The more experiences and experiments accumulate in the exploration of nature, the more precarious the theories become. But it is not always good to discard them immediately on this account. For every hypothesis which once was sound was useful for thinking of previous phenomena in the proper interrelations and for keeping them in context. We ought to set down contradictory experiences separately, until enough have accumulated to make building a new structure worthwhile.