Everything Is Self-evident.

If I Found Any New Truths In The Sciences, I Can Say That They Follow From, Or Depend On, Five Or Six Principal Problems Which I Succeeded In Solving And Which I Regard As So Many Battles Where The Fortunes Of War Were On My Side.

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

The Only Secure Knowledge Is That I Exist.

The Principal Use Of Prudence, Of Self-control, Is That It Teaches Us To Be Masters Of Our Passions, And To So Control And Guide Them That The Evils Which They Cause Are Quite Bearable, And That We Even Derive Joy From Them All.

It Is Possible That I Am Dreaming Right Now And That All Of My Perceptions Are False.