Never undertake anything unless you have the heart to ask Heaven's blessing on your undertaking.

People who never have any time on their hands are those who do the least.

I am grateful that I am not as judgmental as all those censorious, self-righteous people around me. In each of us there is a little of all of us.

He who is in love with himself has at least this advantage - he won't encounter many rivals.

I have often noticed that when people come to understand a mathematical proposition in some other way than that of the ordinary demonstration, they promptly say, "Oh, I see. That's how it must be." This is a sign that they explain it to themselves from within their own system.

I ceased in the year 1764 to believe that one can convince one’s opponents with arguments printed in books. It is not to do that, therefore, that I have taken up my pen, but merely so as to annoy them, and to bestow strength and courage on those on our own side, and to make it known to the others that they have not convinced us.

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.