All Is To Be Doubted.

I Accept No Principles Of Physics Which Are Not Also Accepted In Mathematics.

The First Precept Was Never To Accept A Thing As True Until I Knew It As Such Without A Single Doubt.

The Senses Deceive From Time To Time, And It Is Prudent Never To Trust Wholly Those Who Have Deceived Us Even Once.

What Then Is The Source Of My Errors? They Are Owing Simply To The Fact That, Since The Will Extends Further Than The Intellect, I Do Not Contain The Will Within The Same Boundaries; Rather, I Also Extend It To Things I Do Not Understand. Because The Will Is Indifferent In Regard To Such Matters, It Easily Turns Away From The True And The Good; And In This Way I Am Deceived And I Sin.

And I Shall Always Hold Myself More Obliged To Those By Whose Favour I Enjoy Uninterrupted Leisure Than To Any Who Might Offer Me The Most Honourable Positions In The World.