An understanding of the natural world is a source of not only great curiosity, but great fulfilment.

There's no sense in being precise when you don't even know what you're talking about.

Fine clothes may disguise, but silly words will disclose a fool.

He who is cruel to animals becomes hard also in his dealings with men. We can judge the heart of a man by his treatment of animals.

Early to bed and early to rise, Makes a man healthy, wealthy, and wise.

All our knowledge begins with the senses, proceeds then to the understanding, and ends with reason. There is nothing higher than reason.

We seldom realize, for example that our most private thoughts and emotions are not actually our own. For we think in terms of languages and images which we did not invent, but which were given to us by our society.

Each problem that I solved became a rule which served afterwards to solve other problems.

Generosity is giving more than you can, and pride is taking less than you need.

Admiration is the daughter of ignorance.

I mistrust the judgement of every man in a case in which his own wishes are concerned.

Never ruin an apology with an excuse.

A scholar who cherishes the love of comfort is not fit to be deemed a scholar.

Those who know, do. Those that understand, teach.

It seems essential, in relationships and all tasks, that we concentrate only on what is most significant and important.

Above all be of single aim; have a legitimate and useful purpose, and devote yourself unreservedly to it.

Today you are you! That is truer than true! There is no one alive who is you-er than you!

An intelligent hell would be better than a stupid paradise.

Wisdom is not the product of schooling, but of the lifelong attempt to acquire it.

Judge a man by his questions rather than by his answers.

A crust eaten in peace is better than a banquet partaken in anxiety.