A man has virtues enough if he deserves pardon for his faults on account of them.

The greater part of human misery is caused by indolence.

What we have to discover for ourselves leaves behind in our mind a pathway that can be used on another occasion.

To write brashly about some things, it is almost necessary not to know much about them.

As the few adepts in such things well know, universal morality is to be found in little everyday penny-events just as much as in great ones. There is so much goodness and ingenuity in a raindrop that an apothecary wouldn't let it go for less than half-a-crown.

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.

What you have been obliged to discover by yourself leaves a path in your mind which you can use again when the need arises.