The Book of the science of Mechanics must precede the Book of useful inventions.
That which has no limitations, has no form.
Shadow is the diminution alike of light and of darkness, and stands between darkness and light.
Science is the observation of things possible, whether present or past; prescience is the knowledge of things which may come to pass, though but slowly.
Science is the captain, and practice the soldiers.
Reprove your friend in secret and praise him openly.
Poor is the pupil who does not surpass his master.
People talk to people who perceive nothing, who have open eyes and see nothing; they shall talk to them and receive no answer; they shall adore those who have ears and hear nothing; they shall burn lamps for those who do not see.
Our life is made by the death of others.
Our body is dependent on heaven and heaven on the Spirit.
Nothing is that which fills no space.
Nothing is so much to be feared as Evil Report.