It is impossible for anyone to begin to learn that which he thinks he already knows. Discourses
A fool having enjoyed good fortune like intoxication to a great amount becomes more foolish. Fragment
“Have you never observed how invincible and unconquerable is spirit and how the presence of it makes the soul of any creature to be absolutely fearless and indomitable?” Republic
I ought to know by this time that when a fact appears opposed to a long train of deductions it invariably proves to be capable of bearing some other interpretation. A Study in Scarlet
Quotes