Nothing Is Necessitated Whose Opposite Is Possible.

I Hold That The Mark Of A Genuine Idea Is That Its Possibility Can Be Proved, Either A Priori By Conceiving Its Cause Or Reason, Or A Posteriori When Experience Teaches Us That It Is In Fact In Nature.

Make Me The The Master Of Education, And I Will Undertake To Change The World.

He Who Understands Archimedes And Apollonius Will Admire Less The Achievements Of The Foremost Men Of Later Times.

All The Different Classes Of Beings Which Taken Together Make Up The Universe Are, In The Ideas Of God Who Knows Distinctly Their Essential Gradations, Only So Many Ordinates Of A Single Curve So Closely United That It Would Be Impossible To Place Others Between Any Two Of Them, Since That Would Imply Disorder And Imperfection. Thus Men Are Linked With The Animals, These With The Plants And These With The Fossils Which In Turn Merge With Those Bodies Which Our Senses And Our Imagination Represent To Us As Absolutely Inanimate.

These Principles Have Given Me A Way Of Explaining Naturally The Union Or Rather The Mutual Agreement [conformité] Of The Soul And The Organic Body. The Soul Follows Its Own Laws, And The Body Likewise Follows Its Own Laws; And They Agree With Each Other In Virtue Of The Pre-established Harmony Between All Substances, Since They Are All Representations Of One And The Same Universe.