Doubt must be no more than vigilance, otherwise it can become dangerous.

The highest point to which a weak but experienced mind can rise is detecting the weakness of better men.

With most men, unbelief in one thing springs from blind belief in another.

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.

Man loves company - even if it is only that of a small burning candle.

Good taste is either that which agrees with my taste or that which subjects itself to the rule of reason. From this we can see how useful it is to employ reason in seeking out the laws of taste.

Too much is unwholesome.