See Now The Power Of Truth.

When The Moon Is Ninety Degrees Away From The Sun It Sees But Half The Earth Illuminated (the Western Half). For The Other (the Eastern Half) Is Enveloped In Night. Hence The Moon Itself Is Illuminated Less Brightly From The Earth, And As A Result Its Secondary Light Appears Fainter To Us.

We See Only The Simple Motion Of Descent, Since That Other Circular One Common To The Earth, The Tower, And Ourselves Remains Imperceptible. There Remains Perceptible To Us Only That Of The Stone, Which Is Not Shared By Us; And, Because Of This, Sense Shows It As By A Straight Line, Always Parallel To The Tower, Which Is Built Upright And Perpendicular Upon The Terrestrial Surface.

In The Sciences, The Authority Of Thousands Of Opinions Is Not Worth As Much As One Tiny Spark Of Reason In An Individual Man.

I Am Certainly Interested In A Tribunal In Which, For Having Used My Reason, I Was Deemed Little Less Than A Heretic. Who Knows But Men Will Reduce Me From The Profession Of A Philosopher To That Of Historian Of The Inquisition!

I Truly Believe The Book Of Philosophy To Be That Which Stands Perpetually Open Before Our Eyes, Though Since It Is Written In Characters Different From Those Of Our Alphabet It Cannot Be Read By Everyone.