William of Ockham

“Every universal is a particular thing, and is not a universal except in its signification, in its being a sign.”

“The only reality is the individual.”

“No universal is a substance existing outside the mind.”

“The love of God is the root of all good deeds.”

“The universal is not a thing existing in reality outside the mind, but only an intention of the mind.”

“It is futile to do with more things that which can be done with fewer.”

“For nothing ought to be posited without a reason given, unless it is self-evident or known by experience or proved by the authority of Sacred Scripture.”

“What can be done with fewer is done in vain with more.”

“All science is concerned with propositions.”

“God's omnipotence is limited by the law of non-contradiction.”

“One should not posit many things when one will do.”

“An assertion is false if it is for a time which is not, and it is true if it is for a time which is.”

“Entities must not be multiplied beyond necessity.”

“Plurality should not be posited without necessity.”