He who loves practice without theory is like the sailor who boards ship without a rudder and compass and never knows where he may cast.

I roamed the countryside searching for answers to things I did not understand.

Fame alone raises herself to Heaven, because virtuous things are in favour with God.

Every action needs to be prompted by a motive. To know and to will are two operations of the human mind. Discerning, judging, deliberating are acts of the human mind.

Fear arises sooner than anything else.

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.

To enjoy - to love a thing for its own sake and for no other reason.