Fix your course on a star and you'll navigate any storm.

Weight is caused by one element being situated in another; and it moves by the shortest line towards its centre, not by its own choice, not because the centre draws it to itself, but because the other intervening element cannot withstand it.

Although nature commences with reason and ends in experience it is necessary for us to do the opposite, that is to commence with experience and from this to proceed to investigate the reason.

All thoughts start from emotions.

What induces you, oh man, to depart from your home in town, to leave parents and friends, and go to the countryside over mountains and valleys, if it is not for the beauty of the world of nature?

The knowledge of the past times and of the places of the earth is both an ornament and nutriment to the human mind.

The grave will fall in upon him who digs it.