Nature even in chaos cannot proceed otherwise than regularly and according to order.

There is a limit where the intellect fails and breaks down, and this limit is where the questions concerning God and freewill and immortality arise.

I shall never forget my mother, for it was she who planted and nurtured the first seeds of good within me. She opened my heart to the lasting impressions of nature; she awakened my understanding and extended my horizon and her percepts exerted an everlasting influence upon the course of my life.

That Logic has advanced in this sure course, even from the earliest times, is apparent from the fact that, since Aristotle, it has been unable to advance a step, and thus to all appearance has reached its completion.

The only thing permanent is change.

The more we come in contact with animals and observe their behaviour, the more we love them, for we see how great is their care of the young.

Act so that the maxim of your act could be made the principle of a universal law.